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Roofing

11 degree pitched roof leaking - help!

Anonymous user 28/02/2024 - 3.40 PM

Hi. Hopefully updating this question will enable further responses... What I think is a decent roofer has suggested is to take off the tiles, raise the pitch using firring strips with a 5" to 0 angle. Double felt the roof, replace the velux and flashing at new angle (should be 15-18 degrees) and then replace existing tiles back on, with an extra 'row' of tiles to help pitch further. All sounds great... Any concerns or thumbs up on this out there? Thanks I will try and keep this brief but really - I’m just after some good honest advice. We had an extension a few years ago and we have always been a little suspect of the roof pitch but were assured it’s fine! Having had a roofer round due to water marks on ceiling, they’ve said the roof is a crap job. Wrong tiles for the pitch. The pitch is 11degrees. We have 2 Velux windows which I am told should be a minimum 15 degrees! We have had 3 roofers round... 1 has said he will replace the tiles with correct ones, job done. 1 has said he’ll remove tiles and replace Velux with flat roof windows and apply a new felt roof (triple skin something) and the 3rd sent a drone up and has said he’ll be in touch soon! Please help... I just don’t know what to do for the best and the job seems to be getting bigger and bigger! Worth saying, builder of extension went bust so now it’s a new project that we can il afford 🙈

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6 Answers

Anonymous user

I would say after updating your question that would work a lot better, even having it double felted! Sounds like the roofer knows his stuff. THUMBS UP! 👍

Answered12 September 2018

KSW Roofing & Plastering

Rating: 5 out of 5

Stafford

Different tiles have different specifications on what pitch they can be laid.. double felting will definitely help... but ideally you don’t want the water making it to the felt in the 1st place. The original roofer you think is decent seems too know his stuff! He may get fed up but if you have concerns keep picking his brains.. 👍🏻

Answered1 January 2019

MAINTY PROPERTY

Rating: 5 out of 5

Newport, Gwent

Hello there Wallace-Derby, thanks for the question. The pitch listed here isn’t necessarily the issue, the VELUX can handle this pitch of 11degs, as long as the joining and cuts are true. Actually I would suggest that the most probable cause for the leaks is water back-flowing up the felt underneath the tiles. Before accepting massive cost works of replacing a whole roof, you could look at an effective (and permanent) fix, such as larger roof membranes being installed under the tiles, and also a replacement cementone flexible compound. Failing this, the VELUX pitch can be adjusted and re-installed, building up the rear to compensate.

Answered3 September 2018

Anonymous user

I agree with what M R carpenter said, you could try risking it and go for interlocking clays pantiles however as it’s 1.5 degrees too low you may still have a leak in bad weather from wind blown rain not to mention the windows are too low as well I imagine would be cheapest opinion slightly as you won’t need to buy OSB boards or plywood for decking but you risk paying again a third time if it still leaks personally I’d treat it as a “flat roof” and used 3 layer felt system or GRP fibre glass or rubber roof. GRP fibre glass is the best visually and performance wise in my opinion as it’s truely seamless with the resin and reinforced matting unlike rubber which they advertise as seamless but in my opinion isn’t really truely seamless. Also fibre glass comes in many different colours it also brilliant for weathering around windows too. If you do go for rubber or fibre glass make sure they use tongue and grove OSB boards otherwise your encounter problems down the line and won’t get the life span expected from them.

Answered3 September 2018

Anonymous user

Hi I would use a anchor tile as they can go down to a 11 degrees roof I have done quite a few and also a fibre glass flat roof would sort all the problems out

Answered7 September 2018

Anonymous user

Decra can be used for shallow pitches.Try there website it's a lightweight metal tile and looks nice if installed correct.And a 40 year guarantee.And no I don't work for them.

Answered12 October 2018