rich080487

Thanks for the reply. I am getting my asbestos removed today, so that is the first step in the right direction! I am getting a better idea of what I need to do, and this evening I will be able to inspect the condition of what is left after the asbestos has gone. @Ferdinand Do you have any photos I could look at please. Particularly your flashing and insect netting at the end of your roof sheets please...

Thanks for all the replies everyone. This week a few of my asbestos removal quotes have come back. Most of them are around £500. This was more than I was hoping, but as most of you have said, I don't really have a choice. Thanks for all the comments about bitumen corrugated sheet. Even if I ignore the material differences you have all mentioned, the fact that I can get 3m+ lengths of corrugated steel to span the garage, means installation will be a lot simpler and probably even cheaper than the bitumen version. This has got me thinking about the roof structure... As stated before, I can't rest any joists directly on top of the wall/wall plates because I have restricted height. So I have been looking into a similar approach to @Ferdinand But I have been thinking why would I not rest the joist (purple in picture) on the wall plates (pink in picture) and then secure with small 90 degree brackets. I don't know why, but I would feel more comfortable with this setup. Any thoughts or objections? I think the plan would then be to cover the top with OSB/ply, then membrane, then corrugated sheets. Is this a sensible plan? DO I need the OSB/ply? Do I need battons if I have OSB/ply? Is this the right place for the membrane? I have highlighted a few areas in RED, am I being too picky or will these small angle differences cause me problems? Or are the wall plate on top (green in picture) blocking my ventilation and getting in the way of the OSB/ply? Finally, if I go for the approach in the picture below, there is no ventilation INTO the roof space. There would be a small amount between the OSB/ply and corrugated sheets. How could I introduce ventilation? Do I need to? Could I fill the voids between the joists with insulation? As always, any advice appreciated. Thanks, Rich

Just seen a few other replies. Once again, thanks. I have already got a few quotes for the asbestos removal. Don't worry, that will be the first thing to go! Unfortunately, the main roof of the rest of the property over hangs the garage by a small amount, which limits the height I can go to. This makes me think the long term plan should be to re locate the garage and make it properly detached. I just need to the roof to be replaced so that I can work in my garage safely. Once again, thanks for all the replies.

Thanks for all the very quick replies... I don't want to spend a huge amount, as I may need to relocate the garage depending upon the long term plan... (my wife is already thinking about extensions) Yes. Remove the asbestos roof, and rotten joists. Then rebuild the roof structure from scratch.

Morning,I have moved into a new-to-me 1950s bungalow about 8 weeks ago. It has a garage, which is best considered detatched.The garage has an asbestos roof, brick walls and minimal joists to support the roof, and is 6m x 3.5m. I will need to replace and improve the joist/supporting roof structure.Over the last few weeks I have noticed that the roof is actually leaking (I had replaced the guttering as I thought that was the problem).This means I would like to add a new roof as cheaply as possible, so I have been looking at corrugated bitumen. Any experience or thoughts?I am not a builder, and have not built a roof before. I am practical and a Mechanical Engineer by profession, and happy to learn...Please see photos of existing garage https://photos.app.goo.gl/Xd94qa4haf57amrV9The roof of the house over hangs part of the roof of the garage (it is "semi-attached" on a single corner). So building a roof with joists resting on wall plates isn't an option. So I have been looking at using joist hangers, and therefore positioning the joists between the walls.I have a few questions... It is a flat roof with less than 10 degrees slope, is it ok to have the joist not horizontal? Or should I make them horizontal and then create angle in another way? I'm concerned at the use of joist hangers not perpendicular. Should I attach OSB to the top of the joists to make it easier to add the corrugated sheets? Or would battens be easier? Should I seal where the corrugated sheets meet the top of the wall plate? This would stop animals and insects getting in, but would remove any ventilation. I presume condensation will be an issue if I did this? Would I be better to OSB the bottom of the joists to seal the garage space, and then ventilate above by not sealing the corrugated sheets to the top of the wall? Would I need a vapour barrier? How would I protect against insects and birds? Most important question; am I thinking about this too much? I don't want a wet, cold, draughty garage to work in...Any help appreciated,Rich