HETAS Technical note TN_0022
10 tips for installing Master Flash roof flashings
The Master Flash roof flashing has a flexible design that meets nearly all roofing needs. The flashings are made for maximum resistance to weathering from ozone and ultraviolet light. The flexible soft aluminum base is designed to form a seal on most panel configurations and roof pitches regardless of pipe location. Follow these ten tips to ensure proper installation and avoid some common mistakes.
- Master Flash are recommended for use on deck profile type roofing or corrugated profiled roof surfaces, they are not designed to be used on tiles or slate roofs.
- Ensure the roof is clean, dry and dust free prior to installation.
Each flashing needs fixing kits, (ordered separately), and these fixings should not exceed 38mm apart.
Base Size, (square).
76mm to 152mm
102mm to 178mm
127mm to 228mm
152mm to 280mm
178mm to 330mm
254mm to 467mm
330mm to 660mm
Always aim the that flue outside the diameter is at the smallest size of the flashing. As an example, for a 200mm o.d. flue system use a No. 8 flashing.
- If possible fit the flashing in a diamond shape in the direction of the roof fall, this will avoid a hard shoulder for water to pool against if fitted as a square.
- Apply a liberal amount of sealant to the underside of the flashing, which will create the waterproof seal. Once secured to the roof, apply a further bead of silicone around the edge of the flashing to seal to the roof.
- Cut the rubber upstand to be tight to the pipe outside diameter, hole cut should be 20% smaller than the required diameter, to then stretch the flashing opening.
- A storm collar will assist in preventing water ingress into the building, with a bead of silicone to seal to the pipe - especially on pipes with a folded seam.
- When picking the flashing size, always look towards the smaller size of the upstand. For example, a 180mm diameter pipe would fit the No. 5 (102-178mm), No. 6 (127-228mm), No. 7 (152-280mm) & No. 8 (178-330mm). However it would be preferable to pick the No. 8 option, so that you are not cutting all of the flashing away and leaving nothing of the flashing upstand. This also gives you greater flexibility on steeper angled roofs.
- Black EPDM Master Flash are for lower temperatures up to 100oC continuous, 135oC intermittent, red silicone Master Flash are for higher temperatures up to 225oC continuous, 260oC intermittent.
- Master Flash can be formed into the contours of a corrugated roof.
HETAS Technical note TN_0022
Specflue's Commercial Director, Ian Sams responds to Sadiq Khan's calls for a Wood-Burning Stove Ban in the capital.
As the air now carries an autumnal nip in the mornings and evening, it will not be long before we experience the first frosts of the season,…
Simple step by step guide on how to check your CO alarm is working correctly and prepare it for the coming heating season.
With just a few days until Christmas, most people should be well into their season of burning with their stoves and open fires. However, the…
Wood needs to dry out and allow the sap to evaporate out of the heart of the timber. Drying wood, although sounding a simple process, has a…
The Employer Training Incentive Pilot (ETIP) offers a 25% return against cash paid for additional training to a maximum grant of £1,000 per…
Follow these ten tips to ensure proper installation and avoid some common mistakes.
Schiedel have been manufacturing twin skin flexible liners at their Washington plant for over 40 years and are now proud to offer householde…
Specflue are now offering Third Party Logistics (3PL) services - onward distribution, palletisation, wrapping and packing, 24/7 security.
Specflue will be introducing a new collection of Scandinavian-inspired stoves to the UK market this summer.
As an addition to its range of air pellet stoves, Specflue is now offering the first design diffusers.
For the second year running, Sudbury-based Specflue has received an award that recognises excellence in the design, innovativeness and quali…
Specflue will be showcasing its range of products and online tools on its stand at Hearth and Home this year.
As one of the leading UK supp…
The popularity of wood burning appliances has risen in recent years, which means that heating engineers are more likely to be quizzed
While Britain is warming to the benefits of traditional wood burning stoves, Phil Lowe, Head of Sales and Marketing at Specflue, a leading s…
Specflue has launched a new-look website that allows installers and engineers to easily find and book courses online.
Specflue will be launching the next generation of Heating Interface Units on Stand N6140 at Ecobuild 2015.
Specflue has launched upgrades to a FREE online tool that will help installers and specifiers design and quote for domestic flue and chimney…
Specflue has achieved silver level accreditation under Suffolk County Council’s Carbon Charter scheme.
Specflue has received DEFRA approval for its most popular models of woodburners.
Thermal Integration, whose products are marketed and distributed by Specflue, has unveiled a new website. Heatweb.co.uk brings together and…
Specflue is on a high after scooping an award and two shortlists that recognise excellence in the design, innovativeness and quality of its…