UltraScape Flowpoint Smooth Rapid Set External Paving Grout – Charcoal

UltraScape Flowpoint Smooth is a flowable, rapid-setting patio and paving grout ideal for porcelain paving and filling joints from just 3mm wide. Perfect for all types of paving slabs and setts, including granite setts, sandstone, limestone, Indian stone, Yorkstone, and concrete slabs, Flowpoint Smooth provides a fine aggregate finish that’s especially suitable for porcelain patios.

Supplied in a convenient 25kg bag, Flowpoint Smooth Charcoal is lightweight, easy to mix with water, and fast to apply, making it one of the most efficient and cost-effective paving grouts on the market. Its rapid-setting formula means patios, terraces, and pathways can be jointed far quicker than traditional methods. Simply mix, pour over the paving, work into the joints with a squeegee, and wash off after just 15 minutes to produce strong, durable joints that prevent weeds.

Flowpoint Smooth Charcoal exceeds all requirements of British Standard BS 7533, ensuring long-lasting, high-quality paving joints. Trusted for over 20 years in domestic patios, public realm projects, streetscapes, and landscaping, Flowpoint is fast to apply, cost-effective, and highly durable, with a lifespan of up to 40 years.

With UltraScape Flowpoint Smooth Charcoal, you get professional-quality patio grout for natural stone, porcelain, and concrete paving that delivers robust, seamless, and long-lasting joints.

What is Flowpoint grout?

UltraScape Flowpoint is a rapid-setting flowable grout that is applied as a wet slurry to quickly point patios, paved areas, terraces and paths, even in light rain. Ideal for both domestic and commercial paving projects, Flowpoint can be used with all types of manufactured and natural stone – including sandstone, porcelain, limestone, Indian stone, slate, clay, concrete and granite setts. Flowpoint is an award-winning grout favoured by major contractors that is available in Standard grade, Smooth, ECO with 20% recycled glass and FINE for porcelain. Flowpoint is one of the fastest setting grouts on the market, and lasts anything up to 40 years. Supplied in either 25KG bags, or Fine which comes in a 20KG tub, Flowpoint drys in just 30 minutes and provides a seamless surface with your smooth or riven paving slabs.

How do I use Flowpoint?

This handy reel, from one of our friends and customers David, at Urban Canopy of Derbyshire; on Facebook will show you how to lay Flowpoint, and give you some handy hints and tips. Click here for a video on how to lay Flowpoint Paving Grout.

What is Flowpoint Smooth used for?

UltraScape Flowpoint Smooth is a fast set flowable, paving grout for grouting patios and paved areas, particularly for porcelain & all types natural stone that need a finer joint, Flowpoint Smooth can accommodate joints from just 3mm. Flowpoint Smooth is ideal for paved areas which are rigid or bound, and where a void-free joint is needed. This rapid set paving grout can be used with all types of natural stone, concrete flags and clay pavers.

Use with the UltraScape BS 7533 Mortar Paving System, a range of high performance materials that meet and exceed the strict demands of BS 7533. Including a rapid strength fine bedding concrete – EcoBed, priming slurry – Pro-Prime and flowable jointing grout Flowpoint.

If you’d like to learn a little more about UltraScape Flowpoint, the grades and colours it is available in and why it’s the UK’s favourite slurry paving grout, read our recent blog post ‘What is Flowpoint’ here, or check out our Frequently asked questions here!

How long does Flowpoint Smooth Grout take to cure & set?

Flowpoint rapid-setting paving grout typically takes about 30 minutes to set and can be walked on within one hour under normal conditions. However, the full curing time depends on several factors, including temperature, humidity, and the specific formulation used. In general, at 20 degrees Flowpoint reaches its full strength within 24 to 48 hours, though it may continue to gain additional strength over several days. In colder (click link for our article on grouting in colder temperatures) or wetter conditions, curing may take longer, while warmer temperatures can accelerate the process (click the link for more info). Proper curing ensures durability and long-term performance, making it crucial to follow manufacturer guidelines for optimal results.

Will Flowpoint Smooth Grout Stain My Paving?

Flowpoint Paving Grout is designed to be stain-free and resistant to efflorescence—provided it’s applied correctly and in line with the manufacturer’s instructions.

Staining is not a fault of the product, but typically a result of installation errors. Common causes include:

• Skipping a paving primer like Ultrascape Pro-Prime
• Not lightly misting the slabs with water during application
  
• Over-watering the grout mix, or leaving water sitting on the surface or in the joints
  

These issues can lead to grout haze, surface staining, or uneven color patches—which can be very difficult to clean once set.

How to Avoid Staining with Flowpoint Smooth Paving Grout!

Keep your paving looking its best with these simple best practices:

1. Prime before you grout

Use a high-quality primer such as Ultrascape Pro-Prime to help the paving bond to the mortar bed and block any moisture or stains from migrating through.

2. Keep slabs misted

Throughout the grouting process, lightly mist your slabs using a garden hose with a rose head or a spray bottle. This prevents premature drying and surface residue.

3. Watch your water

Avoid adding too much water to the grout mix, and don’t let water collect on the surface or in the joints. Too much water can result in cracking, staining, and a patchy finish.

4. Use the right tools

Apply the grout with a neoprene squeegee to push the material deep into the joints while clearing excess from the slab surface.

✅ Flowpoint Smooth doesn’t cause staining when used correctly.
Following proper installation steps will ensure a clean, consistent finish—free from haze, residue, or discolouration.

What is the Shelf Life for Flowpoint?

Shelf life from date of manufacture printed on the bag, unopened in the above conditions, for sealed bags is 8 months. Please note: the use of this product after the end of the declared storage period may increase the risk of an allergic reaction.

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.

How many bags of Flowpoint Smooth will I need?

The number of bags of Flowpoint Smooth you’ll need depends on the area in square metres of your patio, the width & length of your slabs, & the width and depth of your joints. As a general rule, for porcelain tiles 600mm x 900mm; with joints 5mm x 20mm you’ll use one bag of Flowpoint per 30m2. For a mixed pack of sandstone slabs you’ll need approximately one bag per 12-20m2, granite setts use more Flowpoint due to their size and depth – you’ll need one bag per 1.5-2m2. For an accurate calculation, please refer to our calculator above.

Got a question about Flowpoint? We have the most comprehensive information online see our FAQ’s, or drop us a message through our contact form—we’ll get back to you by email or phone as soon as we can. We’re a small team, but happy to help. 😊✨