Heavy-duty damp proof course for high structural load applications. Compliant with BS EN 14909:2012 and tested for radon resistance. Available in 100mm to 300mm widths on 20m rolls.
Size
Price
QTY
100mm
£6.54£7.85
112mm
£6.90£8.28
150mm
£10.76£12.91
225mm
£14.00£16.80
300mm
£17.94£21.53
Toughsheet MAX High Load DPC is a premium damp proof course membrane built for construction projects where structural loads are above average. Whether you are laying blockwork on a commercial build or working with heavy masonry on a residential project, a standard DPC simply may not hold up. This high load DPC is engineered specifically for those conditions, meeting the requirements of BS EN 14909:2012 and providing reliable long-term moisture control at the base of walls.
The membrane is thick enough to resist compression under significant dead loads without tearing, splitting or losing its water-resistant properties over time. That matters more than most people realise. A DPC that gets squeezed out of shape between mortar beds in the first few years of a building’s life is not doing the job it was put there to do. Toughsheet MAX holds its integrity under load, which is the whole point.
Where Toughsheet MAX High Load DPC Gets Used
This product is suitable across a wide range of masonry construction applications. It performs well in cavity walls, solid walls, and retaining wall construction. The roll widths available cover the most common masonry dimensions, from 100mm single-leaf blockwork right up to 300mm solid wall construction.
Toughsheet MAX is also tested for radon gas resistance, making it a practical choice on sites in radon-affected areas. Rather than sourcing a separate membrane for radon protection, this DPC covers both requirements in one product. That keeps the materials list short and the installation straightforward.
Radon Resistance and Compliance
Radon resistance is increasingly specified on building projects in affected zones across the UK. Toughsheet MAX is tested to meet radon protection requirements, meaning it can be used where a ground floor barrier is needed alongside standard damp protection. Always check your site-specific radon map and consult current building regulations to confirm what level of protection is required for your area.
Because this high load DPC complies with BS EN 14909:2012, it satisfies the standard specification requirement on most projects and should be accepted by building control without issue.
Installation follows standard DPC practice. Lay the membrane in one continuous piece wherever possible. Where joints are unavoidable, use a compatible jointing tape with a minimum 150mm overlap to maintain continuity. The DPC should be bedded between mortar courses and positioned to support the cavity drainage function when used in conjunction with weep vents. Keep the membrane clean and free from mortar bridging during the build to avoid compromising the damp proof line.
The 20m roll length suits most runs without excessive waste, and the range of widths means you can specify the correct size for each wall type on site rather than trimming down from a wider roll. Five widths are available: 100mm, 112mm, 150mm, 225mm and 300mm.
Pro Tip: When lapping joints, always tape the full 150mm overlap on both edges rather than just pressing the membrane together, as mortar pressure alone will not create a reliable seal under load.
Toughsheet MAX High Load DPC is used in the construction of cavity walls, solid masonry walls and retaining structures where significant structural loads are carried through the wall. It is commonly specified on commercial and heavy residential builds where standard grade DPC would not meet load requirements. The product is also used on sites in radon gas risk areas, where it provides combined damp and radon protection at ground floor level.
Best For
High structural load masonry construction
Cavity wall construction
Solid wall construction
Retaining walls
Sites requiring radon gas resistance
Commercial and heavy residential builds
Available In
100mm width
112mm width
150mm width
225mm width
300mm width
20m roll length
Key Properties
Compliant with BS EN 14909:2012
High load bearing capacity
Tested for radon gas resistance
Compatible with standard jointing tape
Suitable for use with weep vents
Long-term moisture control
Not suitable for: Not intended for use as a horizontal floor membrane or tanking system. Where full radon protection systems are required, confirm the appropriate protection level for your site against current building regulations before specifying.
Install Toughsheet MAX High Load DPC in a continuous run wherever possible, bedded between mortar courses at the correct height above finished ground level as specified in building regulations. Ensure the mortar bed is flat and free from protruding aggregate that could puncture the membrane under load.
Where joints are necessary, overlap the membrane by a minimum of 150mm and seal with a compatible DPC jointing tape on both edges of the overlap. Do not rely on mortar pressure alone to create the seal. Keep the exposed DPC surface clean during the build to prevent mortar bridging across the damp proof line, which would allow moisture to track across the barrier.
Prepare a flat, even mortar bed free from sharp aggregate or debris before laying
Select the correct roll width to match your wall thickness without trimming
Unroll and lay the DPC in a single continuous run wherever the wall length allows
Where joints are unavoidable, overlap the membrane by a minimum of 150mm
Seal both edges of the overlap with compatible DPC jointing tape
Bed the upper mortar course carefully to avoid displacing the membrane
Check that mortar has not bridged across the DPC line as each course progresses
Use weep vents at the base of cavity walls to allow any moisture to drain clear
What does BS EN 14909:2012 compliance mean for this DPC?
BS EN 14909:2012 is the European standard for flexible sheets used as damp proof courses in masonry. Compliance confirms the product has been tested for water resistance, mechanical strength and durability under the conditions it will face in a wall. Most building control specifications require a DPC to meet this standard, so Toughsheet MAX should be accepted without issue on the majority of projects.
Can this DPC be used on radon-affected sites?
Yes. Toughsheet MAX has been tested for radon gas resistance, which means it can contribute to the protection measures required on sites in radon-affected zones. Always check the radon risk level for your specific site using the relevant maps and confirm the level of protection required under current building regulations, as the specification may vary depending on the risk category.
How do I join rolls without creating a weak point in the damp proof line?
Overlap the two lengths of DPC by a minimum of 150mm and seal the joint using a compatible DPC jointing tape applied to both edges of the overlap. Pressing the membrane together under mortar pressure alone is not sufficient and will not provide a reliable long-term seal, particularly under high structural loads.
Toughsheet MAX High Load DPC is manufactured from a high-density polyethylene compound engineered to resist deformation under significant compressive loads. The membrane complies with BS EN 14909:2012 for flexible damp proof courses in masonry construction and has been independently tested for resistance to radon gas transmission. It is supplied in 20m rolls across five widths from 100mm to 300mm to suit standard UK masonry wall dimensions.
Standard
BS EN 14909:2012
Roll Length
20m
Available Widths
100mm, 112mm, 150mm, 225mm, 300mm
Radon Resistance
Tested
Application
Masonry damp proof course
Minimum Joint Overlap
150mm
SKU
DTS-HIGH-LOAD-DPC-TOUGHSHEET-MAX-PREMIUM-20M
Size
100mm, 112mm, 150mm, 225mm, 300mm
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