GEO-PAR Posted June 26 Posted June 26 Hi guys, I have a cut roof (ridge steel with timber fixed inside the flange, then rafters fixed to these timbers). I have just been told by S.E I cannot fix my rafters into the timbers inside the steels using 'skew nailing' and that it needs to be joist hung. Looking online, these varying pitch joist hangers seem crazy money? Like £5 plus per hanger? I found this product at a sensible price but it only goes to 30 degrees, whereas I have a 47 degree pitch roof: https://www.strongtie.co.uk/en-UK/products/ridge-rafter-connector-rr Anyone have any ideas? Cheers
Temp Posted June 26 Posted June 26 On this type of roof the rafters "hang" from the steel so yes nails not enough. Think our SE specified steel straps joining one rafter to the other over the top of the beam.
ProDave Posted June 26 Posted June 26 39 minutes ago, Temp said: On this type of roof the rafters "hang" from the steel so yes nails not enough. Think our SE specified steel straps joining one rafter to the other over the top of the beam. We had similar. I don't even know the make or type, the builder supplied them to the SE's specification. They pass over the top of the ridge beam as one piece and down to the rafters either side. They looked quite substantial metal not like most joist hangers. 4
JohnMo Posted June 26 Posted June 26 Just looked at the photo of our roof our rafters go above the ridge beam. No hangers were needed.
GEO-PAR Posted June 26 Author Posted June 26 (edited) Anyone's thoughts on doing this? Just using regular joist hangers and putting a cut in to the rafter? I guess it's one for S.E Edited June 26 by GEO-PAR
Oz07 Posted June 26 Posted June 26 I've done exactly this for a connection to purlin before. There was no detail on any drawing but had these hangers and the height of the purlin was dictated in line with the rafters. Was where a cut roof met trusses. Not fell down yet.
Temp Posted June 27 Posted June 27 22 hours ago, GEO-PAR said: Anyone's thoughts on doing this? Just using regular joist hangers and putting a cut in to the rafter? I guess it's one for S.E No don't do that. Some of the load tends to pull the rafter away from the ridge beam. Check with your SE.
GEO-PAR Posted June 28 Author Posted June 28 I sent this as a sketch to my S.E and he said it was fine to birdsmouth it to sit in the hanger? Yellow is the timber rafter.
Robbi Posted Sunday at 08:38 Posted Sunday at 08:38 I have exactly the same problem. The s.e drew some joist hangers the had a sloped seat a bit below the ridge beam. The ridge is a doubled 150mm timber and the rafters are the same. That means the cut end is much longer than the 150mm. For the life I cannot find the hangers he drew and the architech has been zero help. There were many inconsistencies in the s.e. drawings and im appalled at the sloppyness of the pair of them. Im having to use a new s.e. to re define the roof and to specify exactly how to connect things with parts that are not imaginary.
SBMS Posted Sunday at 13:26 Posted Sunday at 13:26 On 26/06/2025 at 12:37, JohnMo said: Just looked at the photo of our roof our rafters go above the ridge beam. No hangers were needed. We had same roof design as you but roof manufacturer also specified hangers. Where were your rafters fixed into the ridge beam?
JohnMo Posted Sunday at 14:58 Posted Sunday at 14:58 1 hour ago, SBMS said: We had same roof design as you but roof manufacturer also specified hangers. Where were your rafters fixed into the ridge beam? They are a bird mouth at the ridge beam. Would have to go back through the structural drawings but believe they are angled nails.
SBMS Posted Sunday at 15:24 Posted Sunday at 15:24 23 minutes ago, JohnMo said: They are a bird mouth at the ridge beam. Would have to go back through the structural drawings but believe they are angled nails. Ah - We had the same birds mouth at ridge but pasquill insist on hangers as well! Think they did both in the end 🙄
JohnMo Posted Sunday at 15:47 Posted Sunday at 15:47 Had a look at the notes and they were held in place with framing anchors. Thinking back we were supplied with enough to build several houses. 1
SBMS Posted Sunday at 17:33 Posted Sunday at 17:33 On 26/06/2025 at 10:16, GEO-PAR said: Hi guys, I have a cut roof (ridge steel with timber fixed inside the flange, then rafters fixed to these timbers). I have just been told by S.E I cannot fix my rafters into the timbers inside the steels using 'skew nailing' and that it needs to be joist hung. Looking online, these varying pitch joist hangers seem crazy money? Like £5 plus per hanger? I found this product at a sensible price but it only goes to 30 degrees, whereas I have a 47 degree pitch roof: https://www.strongtie.co.uk/en-UK/products/ridge-rafter-connector-rr Anyone have any ideas? Cheers Our posi rafter roof used Cullen universal hangers around £1.70ea for bulk order.
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