New Garage Build

[may1day]

I have just had a new garage built, the other was sectional concrete and not fit for purpose.
The wall which backs on to the neighbouring garage is block, the builder advised this, as it doesn't show. There is a gap between the garages and the rood is single pitched, so in effect the rain should fall into my garden.
The block wall gets soaked every time it rains and its only summer. I just don't know what to do, I don't want to fall out with builder.

[Ryzen]

Thats half the problem then..the outside wont be pointed and the water will easily penetrate.

[The Builder]

Ok. That explains a lot. 100mm blockwork with no access to point up the joints on the other side as he builds.

Mmmmm.

Well, same as above, but waterproof render the inside. Either a simple additive to the mix, or, for a pukka job, "Vandex" waterproofing slurry as used to completely "tank" basements.

A small amount of damp could still seep along the returns (side walls), but it should do the job.

https://www.toolstation.com/integral-liquid-waterproofer/p80460?store=FB&utm_source=googleshopping&utm_medium=feed&;utm_campaign=googleshoppingfeed&gclid=EAIaIQobChMInp_5kdLp4gIVTbHtCh044wZ2EAQYAiABEgIcOPD_BwE

[Ryzen]

As TB and then another internal leaf of blocks if space allows.

[TonyV]

Ryzen maybe a bit late for OP but for others as client I would have my own drawings and specs for people to quote to, so everyone knows what is expected.

[KARL]

As a last resort, given the impossibility of rendering the outside of the wall in question, is it feasible to install a waterproof covering, perhaps in sheet form an a frame, which bridges the gap (assuming it is very narrow) and extends from within your garage roof and over to the neighbour's, rather like a rectangular umbrella ? Although this would be anchored on your garage, you might need to or be best advised to discuss this with your neighbour before proceeding although there should be no question of adversely affecting him/her, arguably the contrary if this structure drains onto your roof.

[Ryzen]

You mean a bit like the construct methods adopted within the Calais Jungle camp Karl :-)

[KARL]

Ryzen, No, more along the lines when people try to bring sub-standard UK accommodation into the realms of the habitable by cladding it.

[TonyV]

Anyone got any more advice for OP?

[Ryzen]

KARL...how did we get from maydays 'osmotic' garage to Grenfell?

[KARL]

Anyone who knows why cladding (and roofing, overhangs included) is used will understand - Grenfell is but one example, notorious for other reasons than moisture control. The OP's problem appears to be ingress of outer surface water (rainwater), not simple osmosis. I agree with The Builder, Vandex is a useful option but if that or something similar is not chosen then keeping rainwater off the surface to which there is no access is a minimum requirement. One assumes that there is a damp proof course at the bottom of all the walls (to block osmosis).

[may1day]

yes there is damp course and the builder has got nasty with me now, sending demands through text messaging. Cant win.

[The Builder]

My sympathies, Mayday. Getting nasty is usually the last resort of the insecure, and in this case, the inept.

It's done now. Your man is unlikely to be of any help. So, getting back to practicalities: if you intend to just park in there, then I suppose damp patches are more of aesthetic than practical concern.

If you do intend to store in the garage, then there's a pretty good, DIY solution.

Google "Polybond Q19". It's a roll-on, two-pack epoxy waterproof paint product. Been around for years. I've had very good results with it.