Suggestions on sealing old flat roof pipe against brick wall

[steggles123]

All,

I have an old old flat roof with a soil pipe flush against the brick wall. Whilst it's probably not leaking I know it's not the best.

Any suggestions on doing my best to make it leaky-proof-ish?

I know the roof needs replacing but I am not in a position to do so as yet

Any ideas at all?

Kindly,

 

[foxhole]

Coat of bituminous mastic.

 

[^woody^]

You can't make the pipe penetration leak proof when the roof is in such a state

Acrylpol (and flashband). Buy a big tin and do the whole roof.

 

[steggles123]

Hi foxhole/woody.

Cheers for the input.

I assume you are referring to flashband adhesive tape?

For the pipe itself or on the brick behind it ?

I actually had a 20kg tin of acrypol and a large 1m wide of a competitors roof mesh delivered - I couldn't get a wide enough roll in fibreglass.

I intended on covering the full roof (3m wide x 7m long). My calculations were off with the acrypol I think I expect another tin.

Can either of you make it stop raining? Ha.

 

[^woody^]

Can either of you make it stop raining?

Yes, I'll trade you for next week's lottery numbers.

Flashband over any pipe joints, pipe to roof junction and any potential movement joints as reinforcement, then acrylpol over.

 

[steggles123]

Haha yes, letters numbers.

Can you recommend a brand of that bitumous mastic at all?

 

[steggles123]

I managed to get up on the roof for a better look.

Ancient asphalt roof aside - I note the mortar in the flashing is cracked roughly near where the leak occurs ( only during excessive rain ).

The lead doesn't move much at all without poking too hard.

The lead looks similar to these photos all along - only 7m.

Having said that a brand new window was fitted and all of a sudden there's a leak. Window looks sealed sufficiently.

Do you reckon this lead has another year or so life, or am I better of replacing the lead as the mortar needs to be redone?

I see there are differences in opinions - leadmate sealant all the way or leadmate at the back of joint then finish off with cement mortar.

The pointing and internal walls in this property seemingly are lime based. The mortar fizzles with vinegar.

Should the mortar for this flashing return to being lime based, or does it not really matter?

Any thoughts at all?