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What is the name for a membrane added to an old roof?


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I am looking for a word.

 

What are the things called that you put under the bottom edge of old roofs to keep water out. They are like a membrane but just under the bottom row or two of tiles above the gutter?

 

The issue I have is a damp patch on the ceiling below a low-pitch roof - suspect current conditions have blown water up under the tiles, or possibly a valley gutter which needs repair. I am going to have a look at it today or tomorrow.

 

The tiles are double romans at a roof pitch of perhaps 25-30 degrees, and the valley is between an inner right angle corner. In accordance with the Law of Sod, it is above the car port but fortunately above the ground floor only. It may be politic to replace the valley gutter but I do not want to do the whole side of the roof if avoidable. Comments are very welcome.

 

Cheers


Ferdinand

 

Edited by Ferdinand
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https://www.screwfix.com/p/felt-support-tray-1-5m-5-pack/36622?_requestid=454280

https://www.toolstation.com/shop/p37072

https://www.howarth-timber.co.uk/building-materials/roofing/roof-ventilation/eaves/view-product/refurbishment-felt-support-tray

 

Shop around as these seem cheaper than Screwfix (but haven't checked they are same size)..

https://www.amazon.co.uk/Protector-Support-Fascia-Sagging-Protection/dp/B00PQDJNEU/ref=pd_day0_60_3?_encoding=UTF8&psc=1&refRID=CSRRN4REHR8CQ7741CV5

 

If not wide enough you would strip off enough rows of tiles and battens to allow another strip of membrane to be inserted under the lower edge of the existing membrane and put these trays under the edge of the new strip. 

 

 

 

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