Re: what did you do in your garage today?
The front of the roof of the garage has a home built skylight in it to let in some natural light (previous owner not me!) Its been framed out in timber and then a sheet of clear corrugated PVC nailed over it with those old fashioned roofing nails. Anyway, the nails were loose, the plastic cracked and a corner was missing so its been letting in water, this has rotted one of the rafters badly.
I have a new sheet of plastic to replace the cracked old sheet but before I can fit it I need to redo some of the timber framing as its warped badly where its gotten wet and as we're forecast a lot of rain I didn't have time to do that today but I wanted to stop the leak. What I did was sister up a piece of matching 3 x 2 alongside the rotten rafter screwed together with what we call coach screws (think you call em lag bolts) filled the currently open ends of the corrugated sheet with some proper foam packing strips and then ventured onto the roof, I slid a salvaged piece of matching profile corrugated tin under the broken corner which is where most of the water was getting in, screwed it all down properly with proper roofing screws with the plastic rain caps, sealed some old nail holes with silicon covered a second crack with some nasty sticky waterproof sealing bandage. At lunchtime it started to rain and not a drop seems to have come in.
Its just a hack job really as hopefully cost permitting the whole roof will be coming off next year, all the timbers need replacing as they are wormy and rotten in places, the back is a mixture of tile and slate and leaks, half the slate patch doesn't even seem to be nailed on as they slip now and then. I need to raise the eave height over the doors as they're too low to get my truck in so it'll be getting a dormer in this area. It'll get under-felted, re-slated, I want to put three proper skylights in the back elevation to let some natural light in and the front one will go. In time it'll then get insulated.
Oh and I've been banging up some salvaged expanded PU foam insulation. This has come out of some pig stalls in another outbuilding. It was sandwhiched between tow sheets of chipboard that formed the lids of the pens which we don't use. I tore the lids apart but saved the insulation. Its the yellow expanded foam board with a silver coating and oddly one side also has a layer of roofing felt (what you call tar paper) on it which is good as its going where the roof leaks a little! I've started sawing it to size and just wedging it between the roof timbers. Its never going to be warm in there this winter but this might help a little and also keep it drier in there.
You can just see the existing skylight in this picture to the right of the roof.