F Ball - Stopgap 700 Superflex (20kg) Fast Drying Fibre-Reinforced Underlayment

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In stock
  • 10 items +    £60.00
  • 25 items +    £58.15
  • Available for Next Day Delivery
  • FREE Delivery when you spend over £125

F Ball - Stopgap 700 Superflex (20kg) Fast Drying Fibre-Reinforced Underlayment

STOPGAP 700 SUPERFLEX is a fast drying, fibre reinforced self-levelling smoothing underlayment designed for use on plywood, sand/cement concrete and steel subfloors prior to the installation of new floorcoverings. STOPGAP 800 can also be pump applied.

Note: STOPGAP 700 SUPERFLEX is not to be used as an integrated part of a horizontal A-Class division. STOPGAP 700 SUPERFLEX allows resilient floorcoverings to be installed in as little as 3 hours at 20°C, making it ideal for fast-track installations and minimising downtime.

STOPGAP 700 SUPERFLEX is dimensionally stable and is supplied as a pre-blended dry powder which is designed for application between 2-10mm. It is protein-free which allows it to be used in biologically sensitive areas. 

STOPGAP 700 SUPERFLEX can be used to encapsulate wire heating systems over plywood upto a maximum thickness of 10mm.

Technical Information:

  • Appearance: 20kg Lined paper sack
  • Working Time @ 20°C: 20-30 minutes
  • Walk on hardness time @ 20°C: 60 minutes
  • Consumption per mm thickness: 1.40 kg / m2
  • Application thickness: from 2-10 mm



A 20kg bag of STOPGAP 700 SUPERFLEX mixed with 5.0 litres of clean water will cover approximately 5.0m2 at a thickness of 3mm. Note: Coverage rates are based on 5.0 litre water addition.


Pour the mixed material onto the prepared subfloor and allow to flow and attain a smooth finish. Minimal work with a smoothing trowel is required. The use of a spiked roller will help eliminate entrapped air and smooth out flow lines to give a more uniform surface appearance. The mixed material should be applied at a thickness between 2mm to 10mm, but can be taken down to a feathered edge if required. For best results, an overall thickness of at least 3mm should be maintained. 

STOPGAP 700 SUPERFLEX is self-smoothing, but should any imperfections remain they can be removed by rubbing with a carborundum stone when the underlayment will accept foot traffic - typically 1 hour after application at 20°C. This time will be extended with reduced temperatures i.e. approximately 2 hours at 10°C. Note: This product is for internal use only.

For any areas under question please consult the F Ball Technical team.


Drying is dependent on the absorbency of the subfloor, ambient temperature and humidity. Over absorbent plywood surfaces the compound will be ready to receive resilient floorcoverings in as little as 3 hours when applied at a thickness of 3mm. On non absorbent surfaces or application thicknesses above 5mm this time will be extended. When encapsulating wire heating elements, the total thickness of the applied STOPGAP 700 SUPERFLEX must not exceed 10mm.


Suitable steel smoothing trowel, spiked roller, mixing bucket, electric drill and power whisk or suitable pumping equipment. Wash tools with water immediately after use.


This product must be stored under cover, in unopened bags clear of the ground in cool dry conditions, protected from frost and excessive draught. Dampness will reduce the shelf life and may cause the powder to set in the sack.

Shelf Life:

6 months in unopened bags and stored under good conditions.

Delivery Information

We aim to dispatch all orders within 2 working day of receipt. Occasionally public holidays, weekends, weather events, or extremely busy periods may result in extended delivery times. In these circumstances, we will endeavour to communicate with you about the delay and resolve and resulting issues.

Please note that we do not make delivery date promises, however:

- Orders placed before 1pm on a weekday will be processed the same day.

- Orders placed after 1pm on a weekday will be processed the following morning. 

- Orders placed after 1pm on Thursday will be processed and dispatched the following day and out for delivery the following Monday (if Next Day Delivery is selected).

- Orders placed after 1pm on Fridays will be processed and dispatched on the following Monday.

For more information about our Shipping & Delivery services click HERE


UK Mainland Delivery Options:


Free Delivery: Applicable for orders of £125 excl. VAT and above
(Monday – Friday, excluding public holidays)


Collect From Store: 41 Markfield Road, London N15 4QA
(Monday – Friday, 9am–5pm excluding public holidays)


Standard Delivery: 3-5 Working Days
(Monday – Friday, excluding public holidays)


Express Delivery: Next Working Day
(Monday – Friday, excluding public holidays)

Out Of Zone Delivery Surcharges:

Isle of Wight

£12.50 per item (3-5 Working Days)

Isles of Scilly

£12.50 per item (3-5 Working Days)

Northern Ireland

£25.00 per item (3-5 Working Days)

Western Isles

£25.00 per item (3-5 Working Days)

Shetland Isles

£30.00 per item (3-5 Working Days)


£30.00 per item (3-5 Working Days)

Isle Of Man

£30.00 per item (3-5 Working Days)

Channel Islands

£30.00 per item

Republic of Ireland

Not Available


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