What is Flowpoint and how do I use it?
Plus other frequently asked questions

Read our comprehensive list of frequently asked questions about Flowpoint flowable grout. Along with answering common questions such as ‘What is Flowpoint?’ and providing step-by-step instructions on how to use it, we uncover what materials this popular paving grout can be used with, how to prevent stains and the ideal temperatures for application.

What is Flowpoint?

Flowpoint is a rapid-setting flowable grout that is applied as a wet slurry to fix patios, pavers, terraces and pavements in place and prevent weeds from growing between slabs.

Simple to use and with a setting time of as little as 15 minutes (at temperatures of 20oC), the hardened Flowpoint paving grout is ready to be cleaned after 30 minutes and walked on after one hour. It can receive car traffic after four hours. When applied correctly, this paving grout can last beyond 40 years without needing to regrout.

Ideal for both domestic and commercial paving projects, Flowpoint can be used with all types of manufactured and natural stone – including slate, sandstone, porcelain, limestone, Indian stone, plus concrete, clay pavers and granite setts.

Flowpoint is available in either natural grey and charcoal and comes in three variations:

What is Flowpoint made from?

Flowpoint is a cement-based product that is made from a mixture of Portland cement (made from concrete, stucco, mortar and grout) and a blend of special aggregates.

Three variations of the Flowpoint formula are available: Standard Set, Smooth (ideal for pavers with narrow joints, such as porcelain) and ECO. Flowpoint ECO is made from 20% recycled glass, reducing the amount of virgin aggregates used direct from a mine or quarry

Flowpoint comes as a premixed, dry product. Just add 4.25 litres of water and mix for 3–5 minutes until smooth for it to be ready to apply to your paving project.

How long does Flowpoint last?

When applied correctly, Flowpoint flowable grout can last beyond 20 years without the need to grout the paving again. But the manufacturer Ultrascape says that Flowpoint will last beyond 40 years without needing to regrout when applied together with other products in the Ultrascape Mortar Paving System. This system involves using Flowpoint with Eco-bed bedding mortar and Pro-Prime slurry primer.

After purchasing a bag of Flowpoint, it can be used on a paving project within eight months.

How long does Flowpoint take to set?

After mixing, Flowpoint flowable grout will take as little as 15 minutes to set when the temperature is 20oC. As a rule of thumb, the hotter the temperature, the faster the Flowpoint slurry grout will set. It will take a little longer for Flowpoint to set during colder temperatures.

Flowpoint is a rapid-setting grout that should be hardened enough to clean thoroughly after 30 minutes of applying. After one hour you can walk on the paving or patio slabs. A car can drive over the area after four hours.

If you are applying Flowpoint on a very hot day, it is best to apply the slurry grout during the early morning or late afternoon when the temperature is low or falling. Avoid applying Flowpoint during the midday sun on a hot summer day – if the temperature is over 30oC, the flowable grout will set instantly.

Is Flowpoint grout permeable?

No. As a cementitious-based grout, Flowpoint is non-permeable, meaning it doesn’t allow water to pass through it once set. 

Can you use Flowpoint in the rain?

Yes, you can use Flowpoint in light rain as long as the paving joints are not filling up with rainwater. Applying Flowpoint flowable grout on a damp day is actually beneficial to the job as it will stop the wet slurry from setting too quickly.

Before applying Flowpoint, the surfaces of the paving slabs and joints should be pre-soaked. You must keep the whole area damp until you have finished applying the wet slurry – if it is not raining, mist the pavers with a light spray of water. After applying Flowpoint, thoroughly clean the surfaces of the slabs with lots of water to remove any spots of mortar and prevent stains.

Can Flowpoint be used in hot weather?

Yes, Flowpoint flowable grout can be used in hot weather. However, you must not apply Flowpoint if the temperature is over 30oC as it will set instantly. The grout will take as little as 15 minutes to set at 20oC, and a little longer during cooler temperatures. 

If you are using Flowpoint to grout paving slabs and patios on a hot day, try to avoid the midday sun. Instead apply Flowpoint in the early morning or later in the afternoon when the temperature will be much lower.

When applying Flowpoint, we recommend keeping the area damp until you have finished applying the slurry grout. For this reason, a damp day is preferred.

Can Flowpoint be used in cold weather?

Yes, Flowpoint flowable grout can be used in cold weather at temperatures of 2oC and above. Other, more traditional, wet slurry grouts require an actual temperature of 5oC or above.

Do not use Flowpoint when the temperature is lower than 2oC. The ground temperature will always be 2–3oC less than the actual temperature. If the product starts to freeze, you risk creating cracks in the mortar due to water ingress.

A damp, wet day is preferred when grouting paving slabs and patios with Flowpoint as it is important to keep the area damp. However, you should avoid a very wet day so the joints are not filling up with rain.

Where can Flowpoint be used?

Flowpoint flowable grout can be used on any outdoor commercial, professional landscaping or domestic paving project such as:

  • Patios
  • Terraces
  • Driveways
  • Pedestrian areas
  • Pavements
  • Plus, any other types of paving projects

What types of stone can Flowpoint be used on?

Flowpoint flowable grout can be used with pavers and slabs made from:

  • Sandstone
  • Indian stone
  • Slate
  • Porcelain (we recommend Flowpoint Smooth)
  • Limestone
  • Granite setts
  • Concrete slabs
  • Clay pavers
  • Plus, any other man-made or natural stone, regardless of their finish

Please note: Flowpoint is not recommended for use with some darker limestone, such as black limestone, as it can lead to a slight oxidisation. Call our expert team if you would like further advice on the ideal grout for darker limestone.

What is the shelf life of Flowpoint?

A bag of dry-mixed Flowpoint paving grout can be used for up to eight months, providing it remains unopened in its original packaging. Flowpoint must be stored between 5˚C and 30˚C, clear of the ground in cool dry conditions, avoiding frost, drafts and damp conditions.

What sizes does Flowpoint come in?

You can buy Flowpoint flowable grout in a 25kg reinforced paper bag. Three different formulas of Flowpoint are available: Standard Set, Smooth and ECO, which each come in 25kg bags.

Once mixed with water, one 25kg bag of Flowpoint will cover approximately 7–10 square metres of paving. However, this coverage varies depending on the size of the paving and the width and depth of your joints.

Call us on 0845 862 1099 to provide your measurements so we can calculate how many bags of Flowpoint you will need for your paving project. Keep your eyes peeled for our handy product calculator which will be coming soon.

What joint widths and depths can Flowpoint fill?

It depends on the Flowpoint product you are using.

Flowpoint Standard Set and Flowpoint Smooth can both be used to fill paving joints that are 3–50mm wide. Both products can be used for joints with a depth of 20–200mm. With a smoother formula, Flowpoint Smooth is ideal for narrower joints.

Flowpoint ECO contains 20% recycled glass and so cannot be used to fill very narrow joints that are less than 5mm wide. Use Flowpoint ECO to fill paving joints that are 5–50mm wide and 20–200mm deep.

How do I use Flowpoint?

Follow these ten steps to use the long-lasting Flowpoint wet slurry grout to fill paving joints:

  1. Clean the paver surfaces and joints so they are free from debris and any pooled water
  2. Pre-soak the paving joints and surfaces with water to ensure they are damp – a light spray of water should do the trick
  3. Pour the Flowpoint formula into a bucket and add 4.25 litres of water
  4. Mix for 3–5 minutes until the consistency is smooth and free of lumps
  5. Ensuring the area is still damp, apply the mixture immediately by carefully forcing Flowpoint into the joints using a rubber squeegee or using a Berta Sponge Machine – Flowpoint can set within as little as 15 minutes (at temperatures of 20oC) so you will need to act fast
  6. Move the Flowpoint slurry grout constantly around the patio surface to top-up joints where the mortar has sunk
  7. Use the rubber squeegee to remove as much of the paving grout from the surface of the slabs – still keep the surfaces constantly damp to prevent the grout from hardening
  8. Use a brush and lots of water – or alternatively a sponge machine – to remove any grout that has hardened on the paving surfaces
  9. Once the mortar is dry (after 30 minutes), clean the surface of paving slabs thoroughly to remove any spots of mortar and prevent staining
  10. The pavers are ready to walk on after one hour and can receive car traffic after four hours
Watch our two-minute video to see how easy it is to use Flowpoint in your paving project.

Can I use a pressure washer, hose, sponge machine with Flowpoint?

Yes, you can use a pressure washer, hose or sponge machine while applying Flowpoint to pavers.

When using a pressure washer or hose, take care not to apply too much pressure directly into the joints. The idea is to keep the paving surfaces damp and remove any grout on the surfaces. Do not aggravate the setting grout in the joints themselves. Once the grout looks to have set, return 20 minutes later and clean the paving surfaces again. You may want to use a brush.

After applying Flowpoint, you can use a sponge machine straight away to remove any grout from the surface of the paving.

Does Flowpoint prevent weeds?

Yes. Flowpoint rapid-setting flowable grout is an ideal option for preventing weeds from growing between pavers. As a cement-based grout, Flowpoint can prevent weeds from growing between paving cracks for years.

When applying Flowpoint, just make sure the joints are fully filled – with no gaps or cracks – to prevent weed growth.

Does Flowpoint stain?

When applied correctly, Flowpoint slurry grout does not leave stains on the surfaces of your paving materials, regardless of whether they are made from manufactured or natural stone.

When applying Flowpoint, you must follow the manufacturer’s instructions to keep the paving surfaces and joints damp and thoroughly clean-off any excess mortar.

Follow these tips to avoid any stains:

  • Clean and pre-soak the paving joints and surfaces with water
  • Keep the area damp with a light misting of water during application
  • Use a rubber squeegee to remove any excess paving grout
  • Use either a sponge machine or a brush and lots of water to remove any hardened mortar from the surfaces
  • After 30 minutes of applying the grout (and once it has fully hardened), clean the surfaces thoroughly to remove any spots and prevent staining

How do I remove efflorescence stains off my slabs from Flowpoint?

When used correctly, Flowpoint does not create efflorescence stains.

When applying Flowpoint, you should avoid washing it off with excessive amounts of water – doing so can increase the risk of efflorescence. Never spray a hose or pressure washer directly into the paving joints while applying the grout. Instead, spray the water on the paving surfaces to clean them.

Consider using a primer

If you are concerned about efflorescence, we recommend using a primer before laying the paving slabs.

Follow these steps when using a primer such as Pro-Prime with Flowpoint:

  1. Lay the bedding mortar
  2. Paint the back of the paving slabs with primer
  3. Joint the gaps with Flowpoint

You will reduce the risk of efflorescence stains when using the Ultrascape Mortar Paving System. This system involves applying either Eco-bed for the bedding mortar, Pro-Prime for the primer and Flowpoint for the paving grout. When using the Ultrascape system and applying these products correctly, your paving project can last beyond 40 years without needing to regrout.

Can I use a sealer over Flowpoint?

Yes, you can use a sealer over Flowpoint.

Paving Guard is a surface sealant that forms a protective barrier against oil and grease. It can even protect against stains from dog poo and reduces the risk of gum sticking to the paving. Paving Guard is solvent-free.

What should I do if there is nowhere for excess Flowpoint to go?

While grouting your patio, if you have excess Flowpoint wet slurry that has nowhere to flow to, you have three options.

You can either push excess Flowpoint into:

  • The next area you will be paving.
  • A grassed area: use a shovel to lift a patch of adjacent grass and run the excess wet slurry into it. Re-lay the grass once the product has set.
  • A blocked drain: once set, remove and dispose of the dried excess grout. You must make sure the drain is fully blocked to avoid any Flowpoint running down the drain.

How many bags of Flowpoint do I need?

One 25kg bag of Flowpoint flowable paving grout will cover an area of paving approximately 7–10 square metres. However, this coverage varies depending on the size of the paving and width and depth of the joints.

Call us on 0845 862 1099 to provide your measurements so we can calculate exactly how many bags of Flowpoint you will need for your paving project. You’ll soon be able to calculate this yourself using our new handy product calculator – coming soon to our website.

Can I use Flowpoint on porcelain?

Yes. Flowpoint rapid-setting grout can be used with porcelain pavers, plus any manmade and natural stone.

We recommend using Flowpoint Smooth with porcelain pavers. With a much smoother consistency, Flowpoint Smooth works well with narrower joints of 3mm and will suit the look of more contemporary materials and gardens.

How much water do I need to add to Flowpoint?

For the best results, use 4.25 litres of water for each 25kg bag of Flowpoint rapid-setting grout. Add a bag of Flowpoint to a bucket, add the water and mix thoroughly for 3–5 minutes until smooth and lump-free.

How long do I mix Flowpoint for?

After adding water, mix Flowpoint rapid-setting grout for 3–5 minutes. You want to achieve a smooth consistency that is free of lumps before applying the wet slurry to grout the paving joints.

What is the best base for a hot tub?

An above-ground hot tub must be placed on a solid and level surface that can support the weight of a filled tub and the people sitting in it. A well-laid patio made of either natural stone or concrete can support this weight. For extra stability and longevity, it is important to use a quality bedding mortar and strong jointing compound that won’t disintegrate – we recommend Ultrascape Eco-Bed Bedding Mortar and Flowpoint wet slurry grout. 

Never place the tub on grass or concrete ground as the unstable and uneven surface can cause warping and water spills. Timber decking is an option, but it needs to be extremely well designed and reinforced to carry the weight of a hot tub.   

Speak with a qualified landscaping contractor who can help you create a safe and solid foundation for your hot tub. If you want to discuss the options with us, call our team on 0845 862 1099 (Mon-Fri, 8.30am-5.30pm).

What should a hot tub sit on?

If you are installing an above-ground hot tub, a concrete or natural stone patio is an ideal option. Above all else, the foundation must be both solid, level and strong. Together, Ultrascape Eco-Bed Bedding Mortar and Flowpoint wet slurry grout provide the right amount of stability and longevity for a patio to withstand the extra weight for years to come. 

Your new hot tub needs to be placed onto a level base to ensure that the weight of the tub, water and people within it are displaced across the ground evenly. Without a level base, your hot tub is likely to warp and it will cause unnecessary strains on the tub’s structure. An uneven base also risks water spilling over the side.

Can I place a hot tub on patio pavers?

Yes, a hot tub can be placed on patio pavers. For extra stability, longevity and to handle any water spills from the hot tub itself, our experts recommend using: 

  • Concrete or natural stone pavers
  • A stable, solid foundation with Ultrascape Eco-Bed Bedding Mortar
  • A strong, long-lasting jointing compound with Flowpoint wet slurry grout

It is always best practice to create a full, level bed for the patio using a quality bedding mortar. One of the added benefits of using Flowpoint wet slurry grout is if there are any gaps or inconsistencies in the bedding mortar, Flowpoint will find its way to them and make the patio even stronger.

Will my patio withstand a hot tub?

Although most hot tubs are relatively light when empty, your patio will also need to withstand the weight of the water in the tub plus the maximum weight of the number of people who will be in the tub at any one time. 

When deciding whether your patio will withstand the weight of a hot tub, you should consider the: 

  • Type of patio pavers 
  • Condition of the pavers
  • How level the area is
  • Bedding mortar below the pavers
  • Strength of the jointing compound used between the pavers

Our paving experts recommend creating a strong foundation for your patio using either natural stone or concrete pavers. The foundation must be level and solid – Ultrascape Eco-Bed Bedding Mortar together with Flowpoint slurry grout offer the right amount of stability. Flowpoint grout will also withstand any water spills from the hot tub itself.

Is an above-ground hot tub or excavated spa the best option?

It really depends on your budget and how quickly you want the spa experience in your garden. An in-ground hot tub will involve contractor costs including excavation, waste removal, plumbing and tiling, which may take some time to plan and complete. An above-ground hot tub can be overall a cheaper and quicker installation. You just need a solid, level surface that is strong enough to withstand a hot tub full of water and people. Concrete patio pavers – or natural stone pavers – are an affordable and durable choice.

Still have a question about Flowpoint?

If you’re still not sure about whether Flowpoint is the right choice for your paving project or have another burning question about how to use it, get in touch with our expert team on 0845 862 1099. We’re available weekdays, 8.30am to 5.30pm.

Other frequently asked questions

What is Flowpoint?

Ultrascape Flowpoint is a flowable, wet slurry paving grout, made from Portland cement and a blend of special aggregates. Flowpoint paving grout is ideal for quickly pointing joints between slabs in patios, terraces and paving. Flowpoint is simple to use and has an initial set time of just 15 minutes, meaning that your patio can be pointed much faster than using traditional pointing methods.

Flowpoint is suitable for use in all weathers and can be used in the rain, it also prevents weeds from growing between paving slabs! Flowpoint can be used with all types of natural stone – such as sandstone, slate, porcelain, limestone & Indian stone, it can also be used with concrete and granite setts and clay paviours.

Flowpoint comes in three variations, Standard Set, Smooth which is ideal for narrow joints, or ECO – which has 20% recycled material in its formulation.

What colours does Flowpoint come in?

UltraScape Flowpoint comes in two colours which blend perfectly with most natural stones, concrete and granite sets, it comes in Natural Grey & Charcoal.

Can Flowpoint be used on all paving slabs?

Flowpoint rapid set paving grout can be used on most natural stone and manmade slabs – sandstone, Indian stone, slate, porcelain, limestone, marble, granite setts, concrete slabs and clay paviours.

What depth of joint will flowpoint fill?

Flowpoint can fill paving slab joints from 5mm-50mm wide with a minimum depth of 20mm, up to a maximum depth of 200mm in one application.

How do you use Flowpoint?

It is easy to mix and apply UltraScape Flowpoint in between the joints of your paving slabs. Flowpoint comes in a handy 25KG reinforced paper bag, it is a fully premixed dry-pack which is poured into a bucket, then 4.25 litres of water is added to the mix. Flowpoint is mixed for between 3 and 5 minutes until it reaches a smooth lump-free consistency, like a batter mix. Once the mix is ready the mortar should then be applied without delay to the paving slabs. Prior to applying Flowpoint to the patio, joints must be cleaned from all debris and all ponded water removed. The paving surface and joints must also be pre-soaked and kept damp until the jointing process has been completed.

Once the patio or paved area is prepared, Flowpoint must be carefully forced into the joints using a rubber squeegee. Flowpoint slurry grout should be constantly moved over the surface of the patio to repeatedly top up joints where the mortar may have sunk. A rubber squeegee should then be used to remove as much of the Flowpoint paving grout as possible from the surface of the slabs. It is important to remember that the surface of the paving slabs must be kept constantly damp using a light spray of water, when the paving grout has hardened sufficiently the paving surface must be cleaned using a brush and lots of water. It is important to clean the surface of the paving slabs thoroughly, leaving no spots of mortar on the surface of the paving to prevent staining.

How long does Flowpoint take to go hard?

Flowpoint reaches an early initial set after just 15 minutes at 20oC, it should be ready to be thoroughly cleaned after 30 minutes. Patio slabs pointed with Flowpoint will be able to be walked on after approximately one hour, and cars after four hours. It’s important to note also that temperature does marginally affect the set time of Flowpoint, cold temperatures mean the slurry grout will take a little longer to set, warm temperatures will set the grout more rapidly.

How long does Flowpoint last?

Ultrascape Flowpoint can last beyond 20 years without the need to regrout your patio, the manufacturer of Flowpoint, Instaramc suggest that patios or paved areas grouted with Flowpoint will last up to 40 years.

Does Flowpoint stain?

When used in accordance with the manufacturer’s instructions, Flowpoint slurry grout does not stain. Paving slabs should be keep damp with a light misting of water at all times, and should be thoroughly cleaned as the product sets to avoid any staining.

Can you use a pressure washer on Flowpoint? 

Yes, a pressure washer, a washboy or a simple hose can be used to clean the Flowpoint slurry grout from the paving slabs, taking care not to point the hose directly at the joint until it is fully set. Once the Flowpoint grout is set and the joints are fully hardened, the patio can be pressure washed as normal without concern that the joints will crack or mortar break out of the paving slabs.

Does Flowpoint stop weeds?

Yes, Flowpoint prevents weed growth. When applied correctly and as long as the joints are fully filled with no cracks or gags, Flowpoint rapid set grout will eliminate weed growth for years.

When and why was Flowpoint created? 

Flowpoint was created 25 years ago when a project engineer in Scotland who was managing the installation of cobbles in a town centre, came to Instarmac with a problem. The project engineer told the manufacturer that he had a number of contractors on their hands and knees pointing cobbles by hand, which was time consuming, costly and labour intensive. But most of all, pointing by hand was not at all good for the contractors knees and backs. In response to the problem Instarmac produced Flowpoint, a revolutionary pourable slurry mortar as a trial, they sent the bags up to the engineer in Scotland to trial, he loved the new slurry grout that much that he ordered a number of pallets. Paul Butcher, Instarmac Sales Director is proud that the project is still operational today.

From this point Instarmac identified a gap in the market, an opportunity to replace hand pointing and brush in grouts. Throughout the past 25 years, Flowpoint has achieved the prestigious British Standard BS7533, the product has been refined and thousands upon thousands of bags have been used by major contractors across the world. UltraScape Flowpoint has been proudly used in projects in New Zealand, Norway and America – and has been used to carry out block pavement repairs around the Burj Khalifa in Dubai. Ultrascape Flowpoint is today used in every continent in the world.

Features & benefits of Flowpoint!

  • Open to foot traffic in 1 hour
  • Open to vehicular traffic in 4 hours
  • Rapid setting
  • Exceptional bond strength
  • Shrinkage compensated
  • Mixes quickly on-site with water
  • Initial set after 15 minutes at 20o C
  • Economical to use
  • Conforms to BS 7533
  • Ideal for large-scale projects
  • Part of the UltraScape streetscape system, which guarantees compatibility and reduces split liability

Watch this video to see how easy is it to use Ultrascape Flowpoint…