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 Post subject: cut and fit roof rafters
PostPosted: Sun Aug 26, 2018 6:07 pm 
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Just a quick one. What is the importance of cutting roof rafters on a pent roof. I just fitted some rafters and screwed them down with 6.0 120mm screws which are like a tank (rather than nails) and also installed some metal structural fixing brackets for my pent roof before the rain and winds came. No roof as of yet so i have choice to fix this.

A query is what is the importance of cutting a notch in top and bottom of a rafter on a pent roof, i understand that it would make the rafter closer to the supporting wood but apart from being closer does it provide any additional benefit? I cannot decide whether to take the rafters up and cut a notch in for it to be closer.

garden shed, pent roof using 3x2. the entire frame i have used 3x2 and its rock solid, bolted to the ground etc.

I just dont want it to slide with the weight and unsure if the screws and metal brackets will hold it up.

Would you recommend hammering in some thick nails too?


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PostPosted: Sun Aug 26, 2018 7:18 pm 
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The birdsmouth (or notch as you call it) means that the rafter is seated correctly on the plate rather than just sitting on its corner, in time that corner will compress at different amounts along the length of the plate and probably create compression in the rafter too, this is undesirable for a house roof but probably unimportant on a small shed roof.

Another reason for cutting a birdsmouth is to simplify making all the rafters the same length, the plumbcut on the birdsmouth to the plumbcut at the top (not on a pent roof) can be marked quickly from a pattern rafter or batten.

Again, it's probably unimportant for a small shed roof, but galvanised wire nails are the correct fixings for rafters, modern screws don't bend under pressure, they snap.

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PostPosted: Sun Aug 26, 2018 7:21 pm 
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Thanks ayjay that is exactly what i wanted.


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