The garden shed window is the first window to be assembled, because its the smallest.
The core widow frame is just a sill and head, each with rebates to house the jams.
The head and jams are 221mm wide buy about 33mm thick. The only reason they are that thick is because thats the timber that was delivered to me, even though I asked for 25mm rough sawn. There is no point in making it thinner, other than surface planing to straighten the exposed face.
The jams have to be jointed together, because the timber is 190mm wide. So I need to joint on another 30mm. A real pain. It makes the whole process take so much longer. These joints are not using biscuits – I could not see the point. Also I am using Titebond III PVA glue rather than epoxy, so I can get quicker clamp-up times, and because I will orient this joint to the inside so it will not be exposed to the weather.
I am housing the jams into the rebates so to help eliminate twisting over time.
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All the joints are getting two coats of primer/sealer/undercoat prior to assembly. I then use three 100mm type 17 screws on each joint.
In the case of this window I need to add an apron piece below the sill to match up to some existing brickwork on the shed. The apron was biscuited and glued on.
The whole frame will then get three coats of undercoat both inside and out. The reason for undercoating the outside (ie the bit thats hidden by the window frame) is to stop moisture ingress into the frame. Timber warps less if all sides are coated evenly.
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