The Best Timber Garage Specification

I’ll say this quick as not to cause alarm…  A single skinned Garage draws moisture from the air and passes it through its’ walls to the inside of your Garage. It’s not leaking, it’s ingress…

But what if you don’t want it to do that? What if you want it to be nice and dry inside your Garage? How do you stop it from passing moisture through to the internal?

Well in Scotland it’s been raining for a while, maybe 4/5 billion years or so, but nothing like the past 3 – it’s been relentless. So what we’ve had to do is come up with a new plan! A three tier wall construction that laughs in face of water.

And it looks something like this…

Garage Cross Section
Wall Construction: –

 19mm thick tongue and groove pressure treated weatherboard
pressure treating the cladding protects it against rot for over 15 years but we always recommend that you paint it to see the wood lasting many years more.  
22mm pressure treated batten
this is what creates the cavity… Water can do a lot of things but jumping 22mm with no propelled effort is beyond conceivable – however, just to be sure…
breather membrane
This membrane acts a barrier from the outside to the inside and stops any moisture from the external cladding, protruding into the internals. 
9mm OSB sheeting
OSB or oriented strand board is – waterproof adhesives that bond the wood fibres together creating strength and excellent load baring properties.
95mm x 45mm pressure treated framing
Our framing is C16 graded  – meaning it’s really strong and can withstand the weight it must carry plus any additional loads weather or human permitted. 

Roof Construction: –
95mm x 45mm pressure treated framing [minimum size]

16mm tongue and groove sarking treated with Anti-Fungal wash
We like to use the tongue and groove 115mm wide boards because of its bracing qualities.

22mm pressure treated batten

Proctor Roofshield membrane
This provides a secondary barrier to the ingress of rain, wind and snow. It has a low vapour resistance and is air – permeable; additionally, it eliminates the incidence of condensation in pitched roofs.

0.5mm Polyester coated steel box profile sheeting [20 year guarantee]

Steel Box Profile is brilliant, reliable and durable. It’s so good I’ve done a whole blog on it;  Do I need a Steel Box Profile Roof on my Shed

We make our Garages in sections in the workshop and then assemble them like a massive jigsaw on site. We introduced this new Garage specification this year 2016 but we’ve been doing it for years with our Cabins so we know it works. It’s so good when things just work don’t you think?