Sealing a wooden shed against a Pebble Dash Wall

Seve OB · 08-08-2017 9:33am #1

I'm building a wooden shed and it will actually only have a front and and a side. It will be in the corner of 2 existing concrete walls, the back wall is plastered and the right side is pebble dash. I've gotten the battons up against the walls and there is small gaps agains the back wall but against the pebble dash side there are obviously quite bigger gaps. I'd like to seal both up somehow and was wondering what would be the best procedure? I was thinking of using some expandible builders foam, but I've never used that before so not sure how it will work or indeed if it would be suitbale. Maybe some kind of Tec7 or something along those lines?

Incidentally it will be a small shed, but will house some tools and bikes so would like to keep is as waterproof as possible. It will have a small pitch roof with some felt shingles. I was thinking of sealing the join of the roof to each wall with some lead flashing. Is this overkill? or is there another option?

Seve OB · 08-08-2017 9:36am

actually, this might be the job?
http://www.woodies.ie/tec7-pur-expanding-foam-1063776

SC024 · 08-08-2017 4:44pm

wouldnt trust that to seal against water ingress. what are you cladding the exterior of the shed with?

Seve OB · 08-08-2017 9:32pm

SC024 wrote: »

wouldnt trust that to seal against water ingress. what are you cladding the exterior of the shed with?

OSB3 and then shiplap cladding. Was thinking of maybe putting a sheet of breathable membrane between them, what you think?

I'll get some pics up when I get a chance during the week

ronn · 09-08-2017 7:07am

Did you have a look at steel sheds, might work out cheaper in the long run,

jmBuildExt · 09-08-2017 8:02am

The right way to do it (as you suggest) would be to cut flashing into the brick work of the 2 walls and incorporate it into the fall of the roof.

A halfway house for you would be to at least bolster off the dashing under the batton on your dashed wall. (And then fill in with tech 7 or whatever you're having yourself)

But I'd go the first way as I doubt option 2 will stay dry for very long.

Seve OB · 25-08-2017 10:22pm

Update
few pics of what I was faced with

and a few pics of what I did, basically went with that Tec 7 Expanding foam as you can see to get right into the gaps and then sealed around the edges with normal Tec 7

Rabbo · 26-08-2017 11:36am

That's a reasonable solution for what you have built but I would be surprised if you didn't have to do some patching up in a few years time

mp31 · 29-08-2017 2:10pm

How did you seal the top of the roof where it meets the wall i.e. the long straight edge as opposed to the sloping edge if that makes sense. I'm thinking of doing something similar except down the side alley of the house.

Seve OB · 29-08-2017 2:18pm

mp31 wrote: »

How did you seal the top of the roof where it meets the wall i.e. the long straight edge as opposed to the sloping edge if that makes sense. I'm thinking of doing something similar except down the side alley of the house.

I haven't done that yet. I was going to use a grinder and put in some flashing like the below.

https://www.youtube.com/watch?v=f2pq4VPZE0E

But honestly, for what I've built, I think that might be overkill, so I just bought some flash Band and will finish it off with that

https://www.youtube.com/watch?v=U2xFDvhmL3g

Sealing a wooden shed against a Pebble Dash Wall

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