felixfl Posted February 13, 2022 Share Posted February 13, 2022 Hi - I am planning an extension of a home. The old house has a gable roof and I am trying to connect a new gable roof perpendicular to it. Although, I can do a connection with old roof as it is, i.e., with an overlap, I am not able to remove the rafters from old roof to create a triangle path through the old roof into the new roof. i.e., I do not want the section of the old roof over which the perpendicular gable roof is attached/overlaps. please let me know if I am unclear. hope you can tell me how CA can show the exact truss / roof framing that my builder can use. regards Felix Link to comment Share on other sites More sharing options...
Chopsaw Posted February 13, 2022 Share Posted February 13, 2022 So basically you want to cut a great big gaping hole in your roof and then add additional load to the compromised structure ? I think this is a situation where you will want to get the advice of a competent builder before you start drawing. If you are able to provide the necessary details of the existing structure and what you hope to build on top there are people here that can give you advice. Even an over frame is a complex process but what you are proposing is another level above that. Not that it can't be done but it can get quite complicated very quickly depending on the exact circumstances and local building codes. Link to comment Share on other sites More sharing options...
HumbleChief Posted February 13, 2022 Share Posted February 13, 2022 Not exactly sure what you are asking but this might help. 199498449_DOUBLEGABLE.plan Link to comment Share on other sites More sharing options...
Doug_N Posted February 13, 2022 Share Posted February 13, 2022 The valley rafters are normally on the flat over the other roof structure, not on edge as CA generates then though. Link to comment Share on other sites More sharing options...
HumbleChief Posted February 14, 2022 Share Posted February 14, 2022 15 hours ago, Doug_N said: The valley rafters are normally on the flat over the other roof structure, not on edge as CA generates then though. Yes, the video was only intended to show a technique and not any specific construction detail. Do you build in a similar manner in Canada? Link to comment Share on other sites More sharing options...
felixfl Posted February 14, 2022 Author Share Posted February 14, 2022 Many thanks HumbleChief for taking time to explain. It makes lot of sense now. regards Felix Link to comment Share on other sites More sharing options...
felixfl Posted February 14, 2022 Author Share Posted February 14, 2022 Hello All, since you asked for a drawing, I have attached here. As you can see, the first roof slopes down and this makes it difficult to connect the two attics. (Window seems low as I was unable to reduce the height of the Atticl; the attic sits directly above the second floor and I am able to use the mid section, which is 7 ft. high). The red line shows that I need a 7 feet entry into the new attic that I am building, which is a gable roof perpendicular to the existing one on the right. This is the reason I asked whether two roofs can be joined (without lot of overengineering) and come up with a passage from the tallest points on both roof. many thanks Felix Link to comment Share on other sites More sharing options...
HumbleChief Posted February 14, 2022 Share Posted February 14, 2022 32 minutes ago, felixfl said: Hello All, since you asked for a drawing, I have attached here. As you can see, the first roof slopes down and this makes it difficult to connect the two attics. (Window seems low as I was unable to reduce the height of the Atticl; the attic sits directly above the second floor and I am able to use the mid section, which is 7 ft. high). The red line shows that I need a 7 feet entry into the new attic that I am building, which is a gable roof perpendicular to the existing one on the right. This is the reason I asked whether two roofs can be joined (without lot of overengineering) and come up with a passage from the tallest points on both roof. many thanks Felix Yeah, the details matter and in this case defining "a lot of overengineering" might be good next step. Definitely possible, and conventionally framing that new roof is the way to go but as far as getting Chief to (from the OP) "show the exact truss / roof framing that my builder can use." Not going to happen without the needed engineering unless your builder likes to wing it without engineering, permits and inspections. You can however show in Chief an approximate framing possibility that the builder and engineer can then size members etc. and then build. Just shape the roofs in a way that allows for that 7 ft. passageway and let Chief auto frame the roofs. Link to comment Share on other sites More sharing options...
felixfl Posted February 14, 2022 Author Share Posted February 14, 2022 makes a lot of sense. Many thanks for the reply. Link to comment Share on other sites More sharing options...
Doug_N Posted February 14, 2022 Share Posted February 14, 2022 2 hours ago, HumbleChief said: Yes, the video was only intended to show a technique and not any specific construction detail. Do you build in a similar manner in Canada? Yes just like that. So far as I can tell it is pretty much the same everywhere in North America where shingle roofs are used. Link to comment Share on other sites More sharing options...
HumbleChief Posted February 14, 2022 Share Posted February 14, 2022 DOUBLE GABLE.plan Link to comment Share on other sites More sharing options...
Doug_N Posted February 14, 2022 Share Posted February 14, 2022 Here is an illustration of how the plank is laid flat on the roof. Note the sheathing is removed for clarity, normally the sheathing outside of the new roof is left in place, while the sheathing under the new roof is partially removed for air circulation. . Link to comment Share on other sites More sharing options...
HumbleChief Posted February 14, 2022 Share Posted February 14, 2022 1 minute ago, Doug_N said: Here is an illustration of how the plank is laid flat on the roof. Note the sheathing is removed for clarity, normally the sheathing outside of the new roof is left in place, while the sheathing under the new roof is partially removed for air circulation. . Looks good Doug and I never bother to try and build that in Chief and just throw a detail at it in plan view, not worth the effort in my world. What do you think of the OP's challenge after seeing his picture above? Link to comment Share on other sites More sharing options...
Doug_N Posted February 14, 2022 Share Posted February 14, 2022 9 minutes ago, HumbleChief said: Looks good Doug and I never bother to try and build that in Chief and just throw a detail at it in plan view, not worth the effort in my world. What do you think of the OP's challenge after seeing his picture above? It can be done, but it is really awkward to do in CA. Most times I just cover this off with a note pointing at the valley. This note reads "Board 1 x 10 Flat on Existing Sheathing". Link to comment Share on other sites More sharing options...
Doug_N Posted February 15, 2022 Share Posted February 15, 2022 Here is an old video on "California Room Addition". Great job by the author. Link to comment Share on other sites More sharing options...
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