Loft conversion

I'm currently in progress of planning my loft conversion and want to turn it into a bedroom. I need Advice on if my roof needs strengthening up or not.

Asked by Kim on 12th Sep 2023
Expert Trade Answers
"I would get the rafter checked to see if they are right to fit floor boards on first then it’s a yes"
Answered on 15th Oct 2023 - Member since Oct 2023 - report
"Good morning
If your roof is original and and has the old black membrane (felt)
It would be wise to replace
As the old felt is not flexible, when building is in process it will cause movement in the roof which will result in either tearing or movement in the felt which can result in leaks.
These are difficult to trace and repair,
I hope this is of some help to you.

Kind regards
Repel Roofing Co."
Answered on 2nd Oct 2023 - Member since Mar 2023 - report
"If you’re not sure about this then you need a roof survey but yes almost certainly as you would be altering the building and may need to have a steel beam installed."
Answered on 30th Nov 2023 - Member since May 2019 - report
"Hi Kim it all depends on whether you are having a dormer or not?

If not then you would just need to extend the timber by 2-3inches for the insulation

We are currently doing a loft conversion into a bedroom and we've just put 2x2 on the original timbers so that we can get 50mm air flow with 100mm and 25mm insulation in-between the rafters.

If you like any more assistance please call me.

Thanks rob"
Answered on 12th Sep 2023 - Member since May 2017 - report
"You would need to strengthen the floor with steels and a steel by the ridge beam. Also most rafters are normally 4x2 you would need those to be at least 6x2"
Answered on 12th Sep 2023 - Member since Sep 2020 - report
"Hi yes you would need extra timbers when doing that work, Tommy Reahill Flat Roofing ."
Answered on 12th Sep 2023 - Member since Apr 2023 - report
"Good afternoon Kim
Firstly depending on style of roof you got now
Your ceiling timbers now !!! will become floor timber!! So they may need to be upgraded in size and roof rafters you got now may need to be bigger depth to allow for insulation and what we call air flow min 50mm air flow plus insulation
Hope you understand above
Many thanks"
Answered on 12th Sep 2023 - Member since Apr 2023 - report
"Depends on which style of roof you require might be a few velux windows or a construction of a dormer am sure your architect will keep u right"
Answered on 12th Sep 2023 - Member since Apr 2023 - report
"Hi Kim
It all depends on how big the roof is, what it’s being covered with and what structures if any are being added.
I strongly advice you hire a structural engineer to thoroughly assess your situation as each property is different. Without proper calculations unable to advise. Your architect should be able to help recommend someone.
Thank you and good luck."
Answered on 12th Sep 2023 - Member since Sep 2023 - report
We converted my fathers bungalow loft in to a bedroom and following the building regulations, we had to fit Steel RSJ's across the tops of the main walls to ensure that the floor of the new roof was completely separate from the ceiling below. This means that you can move freely on your new floor without the ceiling below cracking. The loft floor joists are often much smaller than the floor joists in the bedrooms and ground floor rooms, so this strengthening is essential in most cases. You may or may not need planning permission but do apply for building regulations. This will ensure that you retain the integrity of the building and will be essential when selling the property in the future."
Answered on 14th Sep 2023 - Member since Apr 2023 - report
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