We are thinking about adding a conservatory and would like some thoughts and advice regarding the dimensioning of glulam for the conservatory frame with a gable roof. See amateur image created in Photoshop showing how it might look on our house.
We are considering a conservatory about 4.6 m deep and 6.3 m wide, with 2.20 m high fixed sections/doors. See image.
We are planning a frame according to an example image with a gable roof with three posts at the front and two at the back near the house. (Note the image is taken from the internet)
We have dimensioned in the glulam app and got 115x115 posts 220 mm above the decking, and then 115x315 beams as a frame on top and at the ridge, and then 56 x 225 as roof beams. With these calculations, we get a roof pitch of between 14-17 degrees (if we calculated correctly) depending on how high we go at the ridge, but it looks nice to align with the bottom of the upper windows. (Note image from the glulam app with half of the conservatory seen from the side, so to speak.
The weight on top will be tongue and groove boards, felt, and shingles above the roof, as well as insulation and interior paneling. What I'm wondering about is the snow that will slide down from the main roof as we are going without snow guards.
We are wondering if this will be too weak or if we have rather over-dimensioned.
Looking forward with excitement to responses with thoughts, tips, and ideas !
The app needs to eat glulam! The construction is oversized and has unnecessarily thick dimensions without justification. A beam with the dimension 66x450 handles the same load as 115x315 at significantly lower volume, weight, and cost. Tables are available in Träguiden (www.traguiden.se) for those interested. I am also quite sure that you or the app have miscalculated the requirement for the ridge beam's load-bearing capacity. I recently saw a building where precisely a 115x315 beam with a span of just over 4 meters was used to support an entire load-bearing wall! The side beams have only half the load compared to the ridge beam and can therefore be thinner. The roof joists don't need to be made of glulam at all. 45x145 is sufficient from a strength perspective. The front edge beam mostly has a decorative function and can be thinner. Without access to all the facts, it's difficult to be more specific than this.
Thank you for your response. The reason we have chosen to calculate 115 x ? around for the glulam beams in the frame is that we want everything to be the same size so that it looks nice, and the rails for the sliding sections build approximately 114 mm, so having 115 stools and beams on top would be perfect. On the other hand, we might be able to solve it in a nice way since we will probably have panels on both the inside and outside, which adds some so that the rail doesn't partially hang in the air, so to speak.
Thanks for the tip about träguiden.se, we'll check that out.
If the roof has a slope of less than 15 degrees, it is not expected that the snow will slide down to the lower part. However, one should expect that the wind can create drifts against the higher part. How much insulation are you planning? In regular buildings, it is usually the insulation requirement that determines the height of the secondary beams. Another small thing to consider is the ventilation of the roof, as the secondary beams (in the picture) are recessed into the side of the ridge beam.
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