However the load of the ridge beam will be relatively small at the new ridge to old ridge junction as it is a triangular load. Like what you have said, he said I can either go with continuous ridge beam spanning from west to the existing ridge junction, or split it into 2 separate beams. and jokingly questioned if I had been speaking to another SE behind his back. He would expect an overbuilt solution for this example.ĭhengr - I also spoke with my SE this morning and he was amused to find I was asking him questions about continuous beams and triangular loads etc. KootK I spoke with a truss specialist this morning and he said he would typically see valley set truss at junctions if the entire roof was new. Honestly guys, this forum has helped me squash all those worrying questions that pop up in my head randomly during the middle of the night! So i can't thank you guys enough! Having a new truss frame as opposed to a ridge beam but there will be less hassle RE: Cross Gable Roof Extension Help! sithlord382 (Civil/Environmental) I think KootK and jayrod12 have proposed a solution where I might have to pay a couple of thousand £ extra in terms of materials for the roof structure ie. 18kN (by using wl/2)ġ8kN as an end reaction of the ridge beam, overbuilt, onto an existing truss frame without incorporating a post just doesn't sit well with me Uniform Load= DEAD - (4.5m x 1.2kN/m^2)LIVE - (4.5m x 0.6kN/m^2) therefore END REACTION = approx. I have just calculated a very very rough calc for the ridge beam spanning from post on dashed line to existing roof ridge junction:Ĥ.4m span of ridge beam, Perpendicular length to ridge beam = 4.5m My only question is even if the new roof over existing roof (right of the post on dashed line) is overbuilt, would you not need another post where the 2 ridges meet? RE: Cross Gable Roof Extension Help! KootK (Structural) 17 Mar 21 18:46ĭhengr - Thats what my roofer was saying as well, definitely have a post on the dashed line and to the left of that post have a 'stick built frame'. Ideally i would like to do option 2 if possible but I cant seem to picture how to support the new ridge beam and construct the cut valley onto existing roof Essentially make the ridge beam independent to the existing truss system as I wouldnt be able to hang it off the existing if that makes sense? He is saying an SE will need to design possibly a flitch beam that will sit on 1 post on the existing left hand side wall (shown as a dashed line) and that will run all the way to the existing ridge and the SE will need to design another post for this beam to sit on, which in turn will have to some how be supported at loft floor with another beam. He sent me over a crude mark up which I have attached below. I do an over build out of the generic ridge beam and rafters (is this a stick built frame). As you guys have said the weight of the valley set truss frame will be minimal and most of the weight will come from the roof tiles etc?Ģ. Because the side extension (cross gable will be at least 4.4m from the existing roof ridge to the existing side wall) he has advised I get a truss specialist to come to site and measure the existing trusses to see if they can take the load of a new roof. I do what you guys have said and go for an over build. He has said that I have 2 options to construct this:ġ. I spoke with a roofer who completed the roof on my actual house extension a few months ago. If everything was to go to plan and I did take on the property to develop I think I would aim to have minimal disruption to the existing house and its roof structure. Thanks for all the responses and apologies for the delayed response. Thanks in advance RE: Cross Gable Roof Extension Help! jayrod12 (Structural) 15 Mar 21 18:03 Would the new roof construction need to be a truss system (therefore do i need to get a truss specialist involved in determining a quote) or can it be open plan with the standard ridge beam, roof rafters etc. My question is how would the new gable roof (which is perpendicular to the existing gable roof) be constructed? The existing roof has a W shaped truss system and surely you can't just snip away at these trusses to make way for the new roof structure as it will effect the structural integrity. I am interested in purchasing the property, carrying out the proposed works and re-selling but I need to roughly figure out how much the proposed works would cost before I go ahead, to essentially see if it is worth it. I went to view the property today and went into loft to find some sort of truss system instead of the open space rafter configuration which I am normally used to seeing. Hi I have been looking at a house (circa 1960s) to purchase that has an approved planning application attached to it, for a side extension that will result in a cross gable roof structure.
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