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Roofing

Existing Kitchen Extension -What’s Required to Vault the ceiling

Anonymous user 03/03/2024 - 3.30 PM

Hi, I’d appreciate some advice on this matter any help is welcome. We have a kitchen in an extension part of the house it is a normal pitched roof with a hip at the end approximately 2.5 x 4 m it’s a narrow U-shaped kitchen. It is single storey. Currently the ceiling is flat and it feels quite enclosed. I wish is to remove the ceiling plasterboard and vault The ceiling by installing collar ties braces using appropriately sized timber and bolts etc. I have been reading a bit about this but it’s still unclear. My questions are Do we need planning permission to do this? •What size collar ties are required? •Will I need a strict so engineer to tell me what’s required? I’m a pretty commentary DIYer e.g kitchen fitting flooring first fix stuff etc. But I don’t want to collar it all up using 5 x 2’s and then it still collapses. I might be worrying about it too much. But I want to be responsible and ensure I do it right.

Are you a tradesperson and able to answer this question?

3 Answers

Anonymous user

The plasterboard isn't holding the roof together. I'm assuming it's a pitched roof and you're insulating and plaster boarding the slope it's self. I'd use 6x2 and timber locks for the ties. You're not adjusting the actual structure so you won't need any planning permission. You'll probably need to find out what thickness insulation you need , it'll be celotex , probably will want about 120mm. If it's how I'm imagining, the collar ties will just help hold it all together and create a small flat surface, normally I have spot lights fitted in that space. Hope I've understood the job properly, tricky without pictures. Hope this is helpful.

Answered17 June 2020

Daniel Ellis roofing ltd

Rating: 5 out of 5

Redditch

Depending on the type of of rafters you have aframe or traditional cut roof depends how hard this will be to do. I tend to never put the flat part no more than 2/3 the way up the slope they serve a purpose ( stop roof spreading and topping walls ). Definitely get some professional advice from a local company who can look at the structure properly. If in doubt use over sized timbers 7x2 to be safe. As a rule if I think 4x2 is strong enough I use the next size up to be safe and so on. Saying that there are many factors that affect timber size loads/span get the correct tradesman and engineers in even just to do the structure.You can then do the rest risk free. The last thing you want is for it to collapse and hurt you or your family

Answered20 June 2020

Anonymous user

No planning permission is normally required unless the building is listed With a vaulted ceiling construction it is always safer to go over size with your rafters depending on the length 7x2 is a safe bet and we would use rafter straps as an added strengthener Collars should be bolted & dog toothed double sided connectors no more than 1/3 down from ridge line and wall plate Insulation should have at least 25 mm air flow above insulation from plate to ridge Over fascia vents to vented ridge system

Answered30 June 2020