Damp on internal garage walls

Danger_Mouse

I have an external garage and want to turn it into a gym space. One of the walls gets damp when it rains so I need to sort this out first.

Its a new build house so there is some sort of damp proofing under the floor. 

Do I need to use tanking slurry or are there other options without spending a fortune?

Bendy_House

Type of wall construction - brick or block? Any external finish like tender?

Anyhoo, assuming it's just a bit porous and cannae cope with driving rain, then - yes- a coat of tanking slurry should sort it.

What are your plans then? A gap and an internal stud wall? Or D&D insulated p'board straight on?

Danger_Mouse

Bendy_House said:

Type of wall construction - brick or block? Any external finish like tender?

Anyhoo, assuming it's just a bit porous and cannae cope with driving rain, then - yes- a coat of tanking slurry should sort it.

What are your plans then? A gap and an internal stud wall? Or D&D insulated p'board straight on?

Just brick and there is no external finish

Not sure whether to just sort the damp and paint, then insulate the garage door and deal with the cold or go full out and get someone to install an internal stud

Bendy_House

Single skin of brick with piers?

andyf1980

We used some Thomsons Water Seal on the exterior wall of ours and that did the trick. It is single skin brick. 

Bendy_House

I'd deffo tank if planning to line inside, tobesure tobesure. But if only painting, it's worth trying just the waterseal I guess

andyf1980

Bendy_House said:

I'd deffo tank if planning to line inside, tobesure tobesure. But if only painting, it's worth trying just the waterseal I guess

I’d agree. We only have a fridge freezer/tumble drier and Peloton bike in ours. It does get freezing in the winter but hasn’t been damp. 

Bendy_House

Good point. Insulation doesn't make a room warmer by itself - it still needs a heat source!

DM's sweating body might do the trick.

On that note, be sure to add a source of controllable ventilation, because lack of will cause damp.

Danger_Mouse

andyf1980 said:

We used some Thomsons Water Seal on the exterior wall of ours and that did the trick. It is single skin brick. 

Did you put anything on the internal side of the wall mate?

Bendy_House

If you are going to do anything other than just paint the insides of the walls, DM, I would absolutely suggest you 'tank' thoroughly. You really don't want any water ingress after that wall has been lined or boarded.

By all means Thompson's Seal as well, and by all means try just that as an easy option if you are only going to apply paint, but I think it would be risky-remiss to not tank that wall fully before actually covering it.

Danger_Mouse

Bendy_House said:

If you are going to do anything other than just paint the insides of the walls, DM, I would absolutely suggest you 'tank' thoroughly. You really don't want any water ingress after that wall has been lined or boarded.

By all means Thompson's Seal as well, and by all means try just that as an easy option if you are only going to apply paint, but I think it would be risky-remiss to not tank that wall fully before actually covering it.

Thanks for the advice. Can you paint directly onto the wall once tanked?

For cost reasons I think just painting will be my first port of call rather than get it boarded up