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Roofing

Unsure about new felt roof, spongy in some areas

Anonymous user 23/02/2024 - 3.43 PM

Hi, we recently had replaced the roof (last week). Following was done: 1. old felt etc was removed 2. furrings were installed on existing deck 3. new osb was laid on furring 4. 3 layers of felt was applied on the top I was walking on it today and in some areas it felt spongy. what could have gone wrong. This is the same roof discussed in another question around ventilation. https://www.mybuilder.com/questions/v/73300/flat-roof-ventilation please advise.

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4 Answers

Topmark Roofing

Rating: 5 out of 5
Kidderminster
Possibly not enough furring strips put in or and 11mm ply /osb instead of 18mm will make it feel spongy under foot my money is 11mm used and not 18 mm hope this helps Thanks mark
Answered11 October 2021
2

Anonymous user

Old deck was not superficial and should of been renewed not over layer. So new roof on top of old roof.cowboys
Answered15 October 2021
0

Tmgroofline

Rating: 5 out of 5
Norwich
It could be original roof was gone due to leaking all original boards that had water damage should have been replaced first
Answered20 October 2021
0

Af building services

Rating: 5 out of 5
Sheffield
The existing deck should have been removed and the firrings screws down onto original rafters then new o.s.b. Installed.
Answered24 October 2021
0