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Loft Conversion

Garage Roof Conversion

Anonymous user 01/03/2024 - 2.56 PM

I have a garage roof with a high enough pitch to utilise space above for storage, in the future I may look to fully convert to an office. Currently the A frames are using 35x95mm beams at lengths of around 5.7m between supported ends. I am thinking of running 45x95mm beams on top of these running across the width of the garage (nearly 3m) at 600mm centres. Should I be supporting these cross beams at the ends using hoist hangers? If so, the garage is a single skin brick, should I install a wall plate or drill the joist hangers straight in to brick? (The wall plates will not be continuous lengths down one side as there is a concrete rear block support in the middle of the outside wall. The wall that adjoins the house is a single continuous wall.) Or perhaps running a I/H beam across the centre of the 5.7m length (supporting from below) and boarding directly on to the existing beams?

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3 Answers

Kelly Building & Joinery Ltd

Rating: 5 out of 5

Carluke

This would require a site survey to give you correct advice

Answered17 August 2021

Posterity Builders

No reviews yet

Sheffield

Without seeing the job in question, it’s a difficult one to try and imagine. However, your suggestion of an I beam underneath would probably be the best option. Probably a 178x103x19kg, but I’d get a structural engineer to calculate for certain. I would suggest bolting another 4x2 timber at the side of your A frames to increase strength, as you shouldn’t really go much more than 2m between each support. Fitting noggings in-between the joist can also improve strength and sturdiness. As for boarding straight down onto your A frame at 600 centres, 400mm is typical for an 18mm board. You might get away with 22mm but I’d just put more timber in to make sure there is no sag due to office furniture and weight. Hope this helps

Answered17 August 2021

J E Righton Builders

Rating: 5 out of 5

Chipping Campden

In this case of additional loadings onto the existing single skin walls you will require a full structural engineers report including a inspection of existing foundations/depth/width etc. to see if this is feasable. Also it looks like you may require some steel support which the structural engineer might recommend, adding further loadings on walls/foundation. If you sell the house in the future this S.eng report will be requested by the purchaser solicitors for the sale. No report is a big disadvantage as this will knock down the price and hinder/delay the house sale.

Answered2 September 2021