How Much Silent Roof Material Do I Need?

Work out how much Silent Roof Material (SRM) your roof needs — and what it will cost — in under a minute. Enter your roof measurements below and the calculator will recommend the best mix of 60 m rolls and cut lengths, with multi-roll discounts applied automatically.

How to measure your roof for SRM

Step 1 — Identify each roof slope

A standard pitched (duo-pitch) roof has two slopes, one either side of the ridge. A lean-to or mono-pitch roof has one. Treat every slope — and any separate roof areas such as extensions or canopies — as its own section.

Step 2 — Measure A: the length along the ridge

Measure the length of the slope along the ridge or the eaves (gutter line). SRM is 1 m wide and the strips sit side by side along this length, so the number of strips you need is A rounded up to the next whole metre.

Step 3 — Measure B: the slope length from ridge to eaves

Measure along the roof surface from the ridge down to the eaves — this is the length of each strip. If you can only measure the building from the ground, use the building width and roof pitch: for a duo-pitch roof, B = half the building width × the pitch factor below (for a mono-pitch roof, use the full width).

Roof pitch	5°	10°	15°	20°	22.5°	25°	30°	35°	40°	45°
Pitch factor	1.004	1.015	1.035	1.064	1.082	1.103	1.155	1.221	1.305	1.414

Step 4 — Work out the area

For each slope: number of strips × strip length (B) = m². Add all the slopes together for the total roof area.

Step 5 — Add an allowance

We recommend adding around 10% for cutting around rooflights, vents and flues, trimming at the edges, and offcuts at the end of each roll.

Step 6 — Choose rolls, cut lengths or both

• Full rolls — 1 m × 60 m (60 m²) at £1,500 + VAT, with 5% off 2–4 rolls and 10% off 5–9 rolls. Ten rolls or more? We’ll give you a project quote.
• Cut lengths — £25 per m² + VAT, from 1 m² up to 59 m². Ideal for smaller roofs or topping up a roll order.
• Free A5 sample — see the material first; just £9.95 postage.

Worked example

A studio 24 m long and 12 m wide with a 10° duo-pitch roof:

1. Slope length B = 6 m (half of 12 m) × 1.015 = 6.1 m
2. Strips per slope = 24 m → 24 strips; two slopes = 48 strips
3. Area = 48 × 6.1 m = 292.8 m²
4. Plus 10% allowance = about 323 m²
5. Each 60 m roll gives nine 6.1 m strips, so 5 rolls cover 45 strips and the last 3 strips plus allowance come from a cut length
6. Recommended order: 5 rolls + 23 m cut length = £7,325 + VAT (including the 10% multi-roll discount) — £775 less than buying 6 full rolls

Securing SRM: fixings and fittings

SRM is held down with galvanised wire ropes running across the matting, tensioned with turnbuckles and anchored to D staple plates, with UV-resistant cable ties and — on steel roofs — rubber-coated magnets. The layout depends on your roof, so send us your measurements and we’ll advise on the fixings you need, or browse our Fixings & Fittings range.

Frequently asked questions

Which way up does SRM go?

SRM has a flat-backed side and an open three-dimensional side. It is laid with the smooth, flat-backed side uppermost, facing the falling rain, in strips running from ridge to eaves so water drains through into the gutters.

What roofs is SRM suitable for?

Any hard-surface roof — including profiled metal sheet and fibre-cement (asbestos cement) roofs. It is used on film and TV studios, sound stages, warehouses, factories, offices and internal sets. If you are unsure whether your roof is suitable, contact us before ordering.

Will it add much weight to my roof?

SRM weighs around 800 g/m² and, because it is more than 95% open and doesn’t absorb water, it doesn’t get significantly heavier in the rain — unlike foam or fibre-based acoustic products.

Are your prices inclusive of VAT?

Prices are shown excluding VAT, with the VAT-inclusive price alongside. UK VAT at 20% is added at checkout. Delivery is calculated at checkout — see Delivery & Returns.

Can you install it for me?

Yes. TV & Film Studio Group is the approved installer recommended by Silent Roof Ltd and has completed more than thirty SRM installations for UK film studios since 2018. Find out about our installation service.