Published January 31, 2018
Visqueen Pile Cap Sealer is a grey cementitious compound containing Portland cement,
specially treated quartz sand and a compound of active chemicals.
When applied to a concrete surface, the active chemicals react with the free lime and
moisture within the concrete to form in depth, insoluble crystals which fill and block all
capillaries, fissures, pores and minor cracks within the concrete. This effectively makes
the concrete watertight for the lifetime of the structure. The 25 kilo Pile Cap Sealer
buckets are supplied in powder form.
Visqueen Pile Cap Sealer is a specialised formulation for use within ground pile caps. The
system can be used in basements as described in BS8102:2009 for:
Grade 1 – car parking
Grade 2 – plant rooms, garages and workshops
Grade 3 – residential (living areas) and commercial applications
Pile Cap system components
Visqueen Pile Cap Sealer
Visqueen VX90 Waterstop – for 90 internal angles and seal around pipe penetrations
including pile caps
Visqueen Waterstop Mastic – secures VX Waterstops in vertical and pile cap
Storage and Handling
Store unopened in a warm – above 5 C – and dry environment. Shelf life 24 months
Protect eyes and skin from contact. Freshly mixed Visqueen Pile Cap Sealer is alkaline,
the use of suitable gloves and eye protection is recommended.
All construction should conform to the Building Regulations, Codes of Practice and British
Standards in current use at the time the building is being constructed. In particular it is
recommended that reference is made to BS 8102: 2009.
The confining concrete must be placed within 5 days of installation of the waterstop
PREPARATION and POST APPLICATION
The surface MUST present an open capillary structure to allow penetration of the
24 hours prior to application surfaces must be porous and wet – sprinkle with water where
Ensure the product is well ventilated for at least 3 days. Protect the coating against
excessive fast evaporation in hot conditions or drying winds by mist spraying regularly.
Please do not pour the water into the powder. The powder is added into a bucket of water at the ratios stated
Visqueen Pile Cap Sealer should be mixed with water at the following ratio by volume:
4 parts Visqueen Pile Cap Sealer
1 part clean water
For Example, one 25 kilo tub of Pile Cap Sealer requires c.6 litres of water,
It is important not to mix more material than can be applied within 30 minutes at 20C, or less in hot
temperatures. Pour the required amount of water into a clean bucket and add the powder slowly, mechanically
mixing to a smooth lump-free consistency. If the mixed materials becomes stiff, do not re-mix with water, but
discard and prepare fresh material.
Pile cap sealing – High Risk
Clean surface by means of jet wash, grit blasting or scabbling.
Apply Visqueen Pile Cap Sealer to the full area of the pile cap including 100mm vertically:
Mechanically mix Visqueen Pile Cap Sealer at an approximate ratio of 4:1 with clean water by volume
by adding the powder into the water.
Coverage rate is 1.5kg/m . This can be achieved by applying one coat or two (2 x 0.75 kg/m²). The second coat
should be applied whilst the first coat is still green.
Roll out Visqueen Pre Applied Membrane to the base of the ground pile cap. Do not cover the pile cap with the
Ensure the product is well ventilated for at least 3 days. Protect the coating against excessive fast evaporation
in hot conditions or drying winds by mist spraying regularly.
Apply Visqueen Waterstop Mastic to the vertical and horizontal as per detail.
Place Visqueen VX90 Waterstop securely and press firmly around the full circumference of the pile cap. Butt
joint and knead lengths together to form a continuous layer.
In order to obtain the required quantity of Visqueen Pile Cap Sealer we have compiled below a usage guideline.
1 tub of Pile Cap Sealer covers c.16m2 therefore one 25 kilo tub of Visqueen Pile Cap Sealer will waterproof the
following amount of piles:
300mm diameter pile caps: 100 piles
450mm diameter pile caps: 66 piles
500mm diameter pile caps: 47 piles
600mm diameter pile caps: 35 piles
Visqueen Waterstop Mastic coverage
As a guideline Visqueen recommend a 2mm thick layer therefore for every 1m length equates to 200 grams of
Visqueen Waterstop Mastic. By using this calculation, one tub of 10 kilos will cover (see detail for area covered)
the following amount of piles:
300mm diameter = 53 piles
450mm diameter = 35 piles
500mm diameter = 32 piles
600mm diameter = 27 piles
Please note the above usage rates are for guideline purposes only and are based on the exact coverage rates.
Please allow for some wastage