Damplas Radon Gas Barrier 400 is manufactured from a controlled blend of virgin polythene for use in buildings as a barrier to the ingress of harmful radon gas.
Supplied in a 20m roll, it can also serve as a damp proof membrane and can be used in most common flooring constructions – but isn’t intended for use where there is the risk of hydrostatic pressure.

• For use in buildings as a barrier to the ingress of harmful radon gas
• Complies with new BBA regulations for radon protection membranes in line with BS8485:2015+A1:2019 and NHBC guideline revision 01/24
• Conforms to BR 211:2015 – industry guidance for radon gas protection
• Increased thickness of 1600g for greater protection from radon gas and damage during construction
• Also acts as a damp proof membrane

Delivery (UK mainland only)

 

Next Day: £5, or FREE over £40

- Order by 9pm Mon-Thu: next working day

- Order Fri to 5pm Sun: Monday

- Order after 5pm Sun: Tuesday

 

Pre-12pm: £10

- Same cut-offs as Next Day above

 

Saturday & Sunday: £10, or £5 over £40, or FREE over £75

- Saturday: order by 6pm Fri

- Sunday: order by 4pm Sat

 

Heavy items (over 30kg)

- Mon-Fri only. Order by 6pm and allow up to two working days

- Order after 6pm Thu: arrives after the weekend

 

Supplier items

- Sent directly by the supplier, so timings vary. Lead times appear on the product page in working days (Mon-Fri)

 

More about delivery 

Next Business Day Collection (eligible items)

- Order by 9pm Mon-Thu: collect next day

- Order after 9pm Thu to 5pm Sun: collect Monday

- Heavy items (over 30kg): allow up to two working days

 

Opening hours

- Weekdays vary by branch: open 6:30am-7am, close 6pm-8pm

- Saturday: 7am-6pm

- Sunday: 9am-4pm

 

Check your local store's hours and that it's open before visiting. Please wait for our text or email before collecting.

 

Holding your order
We'll hold it for 14 days, then automatically refund your original payment method.