Illo77
2018-08-07 10:48:19
- #1
Hello,
I would like to hear your opinion and tips.
Right away, here are the two data points: snow load zone 2, wind zone 3.
I want to build a freestanding double carport, and I am unsure about the purlins or collar beams or whatever you call them (I believe in some regions they are also called [Rähm?]), as I have seen many different variants in carport construction.
I originally planned to notch out 6 cm on the 12x12 cm KVH posts and lay a 6x24 cm collar beam on top, which I would then bolt to the posts with 12x140 mm carriage bolts. That’s how I’ve seen it done with many various carports, especially prefabricated ones but also some built by craftsmen. However, you often read that by removing 50% of the material at the top of the post, the structure is weakened; could it break off or can you do it without any worries? Is it safer to go with glulam posts or increase the post size to 14x14 cm for more “meat”?
An alternative would be to use a 12 cm thick collar beam as well, but how do I fasten that (without advanced craftsmanship) to the post? At my parents’ place, they used a 12x20 cm collar beam and screwed a large/long flat-head screw from above through the collar beam into the head of the post; is that enough? I am a bit skeptical about screwing a large screw into the end grain.
Working with angle brackets from underneath looks dumb, and nailing perforated plates from the inside doesn’t look very appealing either.
There will be 5 posts per side at a distance of 138 cm, with 3 side panels each having about 100-120 cm high wall cladding; the rear panel and the back side will be closed up to the top edge (the back will also have posts with a similar spacing).
Oh yes, [Kopfbänder ja oder bei Wandverkleidung?]
I would like to hear your opinion and tips.
Right away, here are the two data points: snow load zone 2, wind zone 3.
I want to build a freestanding double carport, and I am unsure about the purlins or collar beams or whatever you call them (I believe in some regions they are also called [Rähm?]), as I have seen many different variants in carport construction.
I originally planned to notch out 6 cm on the 12x12 cm KVH posts and lay a 6x24 cm collar beam on top, which I would then bolt to the posts with 12x140 mm carriage bolts. That’s how I’ve seen it done with many various carports, especially prefabricated ones but also some built by craftsmen. However, you often read that by removing 50% of the material at the top of the post, the structure is weakened; could it break off or can you do it without any worries? Is it safer to go with glulam posts or increase the post size to 14x14 cm for more “meat”?
An alternative would be to use a 12 cm thick collar beam as well, but how do I fasten that (without advanced craftsmanship) to the post? At my parents’ place, they used a 12x20 cm collar beam and screwed a large/long flat-head screw from above through the collar beam into the head of the post; is that enough? I am a bit skeptical about screwing a large screw into the end grain.
Working with angle brackets from underneath looks dumb, and nailing perforated plates from the inside doesn’t look very appealing either.
There will be 5 posts per side at a distance of 138 cm, with 3 side panels each having about 100-120 cm high wall cladding; the rear panel and the back side will be closed up to the top edge (the back will also have posts with a similar spacing).
Oh yes, [Kopfbänder ja oder bei Wandverkleidung?]