Technique for fixing torch on roofing felt

Christyt

I have a technical question re repairs to a torch on roof.

There are a few areas on the laps on my new torch on roof that are not sealed properly. You can stick a scraper underneath and lift up the edges.

I understand it is possible to reactivate the bitumen under the laps using a small torch and reseal the edges.

However I know you have to be careful doing this so you don't damage the surface of the felt.

Because it had been raining, the roofer who came to rectify his work began by waving his torch over the surface of the lap to dry it off.

I wanted to know whether this could damage the surface or whether this would be considered a reasonable thing to do. Or should he wait until the roof is naturally dry to do the work?

V v grateful for any informed advice.

keystone

No I've seen them do that a lot and I wouldn't worry. If you have an issue/question with what a tradesman is doing as he's doing it there is no harm in asking there and then. He should be happy to explain the whys and wherefores. I appreciate why you are nervous in this instance.

Cheers

ormus

as long as the flame is kept moving, there is little danger of any damage to the felt.

Myser

When I initially read the title of your post, I thought you were trying to fix a torch on a felt roof!

I was wondering why you weren't fixing it on the ground - much easier!

All makes sense now after reading the post!

slipperyshoe

No reason felt cannot be tried with a torch. You will no if there is any damage as the bitumen will either bleed through the mineral chippings. Other thing to remember is not to tread on those bits which you have just dried as this is likely to mark it.

If you are trying to re-seal those bits which you posted a pic of on a previous post then I would recommend using a small gas torch, like a plumbers torch (similar to what a chef would use on a creme brulee!). A sales assistant in a DIY shop will tell you it isnt suitable but it is the best thing for what you need to do.

Other possibility would be to heat a scraper up until it is red hot, then stick it in the lap, warm both bits of felt and then pull it out and remove. You will need to press the felt down to get a bitumen bleed; either wear gloves or be very careful as bitumen burns hurt (will be about 170 degrees C)!

Might be an idea to use damp gloves in order to try and prevent marking the felt.

Good luck

Christyt

Thanks everyone - that helps a lot. Happy New Year!