Ashlar walls

[chirpychippy]

Hello all, This is a question for the professionals from a professional. Loft conversions, I have been taught to form ashlar walls by bolting 4x2 uprights to the side of the rafter "timber locks to be precise' and only 1 per upright. This has always struck me as wrong because the purlin is supported by a strut that is at 90 degrees to the pitch if the roof whereas the 4x2 is vertical. Its not the fact its vertical its the junction to the rafter using one timber lock per upright per rafter doesn't cut the mustard in my head. Surely I should be putting a plate on the underside of the rafter and reverse birdsmouthing the uprights onto it?

How do you guys form them?. Cheers

 

[pinenot]

The traditional way (in Scotland anyway) was to half lap the ashlar studs to the rafters on one side, nail through to the rafter and nail the studs to a batten on the wall head, thereby forming three point of bracing i.e. triangulation. On some of the older buildings I've worked on the dwarf studs were fixed to the rafters with draw pegs or hand made nails, forming a very tight joint...pinenot

 

[catlad]

If not not using the purlin then I do it the way have suggested, and I find it makes it a lot easier to line everything up.