Rising damp - garage conversion

[mm511]

I have just started a garage renovation converting it into an office. I have just plastered the walls and insulated the room but now as its been raining I've noticed rising damp creeping into the garage.

I have a temporary barn door that isn't exactly water tight but I was hoping that at least no water would be finding itself into the garage. Does anyone know what I can do to remedy this?

[sfella]

I'd say the floor doesn't have a dpc and th3 external shot shows a wet wall as it has vegetation growing out of it. Is there a leaking drainpipe above or anything obvious why it's getting so wet?

[119]

Doesn’t look like a cavity wall either.

[Cow Corner]

Few factors could be at play here…

What appears as though it might be a half brick thick wall (from the piers), potential failed or missing rainwater goods (based on the damp bricks at ground level) and exacerbated by taking the plaster all the way down to slab level.

Other factors which I can’t see, but are possible, given the lack of information… Inadequate drainage or falls to the external paving, bridged or missing dpc etc etc.

Some wider photos and information on the works you’ve done so far might help us narrow it down.

[mm511]

Cow Corner said:

Few factors could be at play here…

What appears as though it might be a half brick thick wall (from the piers), potential failed or missing rainwater goods (based on the damp bricks at ground level) and exacerbated by taking the plaster all the way down to slab level.

Other factors which I can’t see, but are possible, given the lack of information… Inadequate drainage or falls to the external paving, bridged or missing dpc etc etc.

Some wider photos and information on the works you’ve done so far might help us narrow it down.

Hi it was an existing garage and all I've done is added insulation to the walls.





I've also added a view from the neighbours side


The other side for drainage

[James-gbg1e]

Have you battened and barriers the walls before adding the insulation?

You need to write up your method properly, we're guessing!

[guitarcarfanatic]

Single skin wall - hopefully you took steps to stop water entering the internal space before insulating? Otherwise, you are just going to get damp and eventually mould all over the internal plasterboard walls.

[Aluminati]

guitarcarfanatic said:

Single skin wall - hopefully you took steps to stop water entering the internal space before insulating? Otherwise, you are just going to get damp and eventually mould all over the internal plasterboard walls.

This, built directly off a slab.

[Dannbodge]

Had the same issue with my single skin garage.

Bought some tanking slurry and used it round the bottom of the inside before I boarded it.

Have had no issues since doing it, I also painted the inside before the board as I had moisture coming directly through the walls.

This round the base - https://www.permagard.co.uk/permaseal-tanking-slur...
This on the walls (inside) - https://www.permagard.co.uk/damp-proof-paint
and this on the walls (Outside) - https://www.permagard.co.uk/microshield-ultra-maso...

[Peter911]

Dannbodge said:

Had the same issue with my single skin garage.

Bought some tanking slurry and used it round the bottom of the inside before I boarded it.

Have had no issues since doing it, I also painted the inside before the board as I had moisture coming directly through the walls.

This round the base - https://www.permagard.co.uk/permaseal-tanking-slur...
This on the walls (inside) - https://www.permagard.co.uk/damp-proof-paint
and this on the walls (Outside) - https://www.permagard.co.uk/microshield-ultra-maso...

Thank you for these. I’m about to convert my stables and have no idea these products existed 👍

[mm511]

Dannbodge said:

Had the same issue with my single skin garage.

Bought some tanking slurry and used it round the bottom of the inside before I boarded it.

Have had no issues since doing it, I also painted the inside before the board as I had moisture coming directly through the walls.

This round the base - https://www.permagard.co.uk/permaseal-tanking-slur...
This on the walls (inside) - https://www.permagard.co.uk/damp-proof-paint
and this on the walls (Outside) - https://www.permagard.co.uk/microshield-ultra-maso...

Thanks will consider this and try it this week

[James-gbg1e]

So you have zero vapour barrier between the wall and the insulation? If so I'm not sure how you ever expected to not have damp issues!

[Little Lofty]

I take it building control are not involved in this conversion? You will always have damp problems with a single skin and original concrete floor, it’s not really fit for purpose as it stands, it needs a dpc, vapour barriers and massively more insulation for starters.

[guitarcarfanatic]

All the rubbish piled up against it won't be helping - have a tidy up