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Damp Proofing & Roofing Felt | DPC, Membranes & Roof Protection

Protect your property from moisture and rising damp with our range of high-quality damp proofing products and membranes. Ideal for both new builds and renovations, our range includes damp proof course (DPC) rolls, damp proof membranes (DPM), cavity trays, and tanking solutions for internal and external use.

Whether you're tackling a full basement conversion or laying foundations, we stock reliable solutions for moisture control, waterproofing, and structural protection. Trusted by builders and DIYers across the UK.

✅ DPC Rolls for horizontal damp protection
✅ Heavy-duty DPM for floors and groundworks
✅ Roofing Felt & Adhesives

Nationwide delivery available. Shop damp proofing supplies online or visit us in-store.

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Bitumen Paint 5Ltr (Bond-It)

£24.00 - £24.00
£24.00
£24.00 - £24.00
£24.00
In stock

Bitumen Paint 5Ltr (Bond-It) Discover the ultimate solution for protecting your surfaces with Bond-It Bitumen Paint. This premium-quality ...

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£24.00 - £24.00
£24.00
£24.00 - £24.00
£24.00

Damp Proof Membrane 4m X 25m 300MU (1200 Guage) Visqueen

£50.70 - £50.70
£50.70
£50.70 - £50.70
£50.70
In stock

£50.70 - £50.70
£50.70
£50.70 - £50.70
£50.70

Heavy Duty Roofing Felt, 10m x 1m Capsheet Green Mineral 35kg

£42.00 - £42.00
£42.00
£42.00 - £42.00
£42.00
In stock

SUPERIOR HEAVY DUTY GLASS FIBRE MINERAL SHED ROOFING FELT  Roll Size: 10m x 1m x 40kg Green Mineral slate top side with a film faced bottom side S...

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£42.00 - £42.00
£42.00
£42.00 - £42.00
£42.00

Supa Tec Torch on Mineral SBS 4kg - 36kg Charcoal 8m x 1m Torch on Felt

£55.86 - £55.86
£55.86
£55.86 - £55.86
£55.86
In stock

SBS Reinforced Polyester Felt - Ultra Strong 8m x 1m x 4kg/m2 Green mineral Waterproof Self protected 10 year life expectancy Cap/top sheet Torchi...

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£55.86 - £55.86
£55.86
£55.86 - £55.86
£55.86

Ondutiss Vapour Permeable Underlay 120g 1 x 50m roll

£49.20 - £49.20
£49.20
£49.20 - £49.20
£49.20
In stock

Ondutiss Air120 is a 120gsm high vapour permeable membrane, suitable for cold and warm roof applications. High vapour permeability ensuring the mem...

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£49.20 - £49.20
£49.20
£49.20 - £49.20
£49.20

Supa Tec Torch on Underlay SBS 2.2mm Glass Fibre 42kg Sand 15m x 1m x 2mm

£57.05 - £57.05
£57.05
£57.05 - £57.05
£57.05
In stock

Supa Tec Torch SBS Underlay Available Roll Size: 15m x 1m x 50kg (2.2mm thick) SBS (Styrene - Butadiene - Styrene) Modified Bitumen LIFE EXPECTAN...

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£57.05 - £57.05
£57.05
£57.05 - £57.05
£57.05

Felt Adhesive black 5L (Bond it)

£23.98 - £23.98
£23.98
£23.98 - £23.98
£23.98
In stock

A cold applied, solvent-borne, heavy-duty adhesive for bonding all types of bituminous roofing felts to asphalt, felt, metal and concrete. It can b...

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£23.98 - £23.98
£23.98
£23.98 - £23.98
£23.98

DPC - Damp Proofing & Roofing felt

£4.92 - £28.87
£4.92 - £28.87
£4.92 - £28.87
£4.92
In stock

Damp proof course, or DPC, offers a protective barrier and is used within the inner layers of brick or block walls to protect buildings from rising...

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£4.92 - £28.87
£4.92 - £28.87
£4.92 - £28.87
£4.92

Alter Supplies & Contracting

4.9

93 reviews on

Write a Review
Caroline Clulow
September, 2025
This may sound crazy but, honestly, I've never had such good service. Young men, mostly, who were knowledgeable and so helpful. Don't google for wood, most places are very expensive. Pieces that were £15 on Google were £4 here. 1.8 metre slats at £1.20. Great company.
George Davies
August, 2025
Friendly polite staff nothing to much trouble fast home delivery service would recommend to everyone
Adam Plenderleith (RevRev)
August, 2025
Another delivery from Alter Supplies today. Amazing service even for a relatively small order. Timber and slabs delivered promptly by a very cheery young man! An easy 5* given!
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