Flat shed rood - pitch and span questions

amatureleccy · 21 Jan 2021

I am about to start building a shed and am planning the roof. I have decided on a flat (1 in 12 pitch) roof with 18m OSB boarding and EDPM on that.

The shed with be 2.4m across and I live in a light snow area.

I am planning to have a doubled up wall plate made of 2 2X4s.

The verticals posts will be 2X4 at 40m centres.

Therefore the span distance is 2.2m.

According to the tables, for this pitch, I can only use 2X6 rafters. And according to the tables I can have them at 600m centres.

I am glad I checked the tables because I was planning on using 2X4 - oops.

https://www.rightsurvey.co.uk/roof-rafters-span-tables-for-surveyors-roof-construction/

These are the tables I used.

Have I read these correctly?

Thanks

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Flat shed rood - pitch and span questions

amatureleccy

DIYnot Local

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