Roofing Question

Roof repair - install sarking felt


Trying to buy a house and had a survey come back saying there is no sarking felt internally which is required to prevent rot. Is this an easy thing to have done? If so is it expensive? It is a 3 bed detached house (on the small side).

3 Answers

Best Answer

basically means the ridge tiles, roof tiles, lathes, need to be removed. now adays use a breathable membrane install membrane, new lathes,re-tile re and re-ridge,seal the eaves.

or as it is know a strip and relay average semiwithout looking at the sizes or the area £5k

while your surveyor may be right in the fact the building has no felt, their are still a lot of old buildings with slate tiles on the roof that do not have felt on them as long as their is no water ingress and the roof space is well ventilated it does not need to be a problem.

a well ventilated roof [ cold draughty roof will stop your timbers rotting ] as long as their are no tiles missing underfelt is a secondary defence against water penetration your roof tiles,flashings are the main defence.

good luck alex

Answered 11th Jan 2012

ADR Property Maintenance

Member since 1 Mar 2009

Many houses have no felt with no problems, if the roof isnt leaking I wouldnt worry about it.
To felt the roof, it would need scaffolding, completly strip the roof, new breathable felt, battens and retile.
Allow for breakages.

Answered 12th Jan 2012


Member since 29 Oct 2008

Obviously the roof is original, ie never been re slated. Having no under felt unless there are missing slates will NOT cause rot.
Sarking felt is to prevent dust and draughts blowing under the slates.
Before using felt the slates were back pointed with sand lime cement and horse hair mix. It does fall off over the years.
The only way to install under felt is to strip off all the slates and lathes.

Answered 11th Jan 2012

Northwest Roofing and Building Maintenance

Member since 9 Jun 2011

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