Gary009 Posted June 13, 2022 Share Posted June 13, 2022 Hi, iv received some drawings to sister some 100mm rafters with 200mm rafters for added strength in a loft. Surely this won’t work with the deeper timber over the plate? There will be a stud wall at mid span acting as a purlin but I can’t get my head round the main plate detail unless just a seat cut which will effectively make it the equivalent of 100mm again or am I reading Tom much into it? Thanks Link to comment Share on other sites More sharing options...
joe90 Posted June 13, 2022 Share Posted June 13, 2022 Sistering is all about stopping deflection (bending) which the added 200mm will sort so don’t worry about the wall plate only resting on 100mm 👍 Link to comment Share on other sites More sharing options...
Gary009 Posted June 14, 2022 Author Share Posted June 14, 2022 Thanks Joe, much appreciated 👍 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted June 14, 2022 Share Posted June 14, 2022 Link to comment Share on other sites More sharing options...
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