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12 replies
10k views
12 replies
Impregnated post 95x95 for patio roof, is it sufficient?
Hi,
I am completely a novice in the noble art of construction and am now attempting to roof part of our porch. I hope that the brain trust here on byggahus can help me.
I have bought pressure-treated beams in the dimensions 95x95: https://www.beijerbygg.se/privat/sv...-46/95x95-impr-hyvl-klass-a-3-0m-880509509530
My idea was to use these as posts to support the entire structure. Now I've read up a bit, and they aren't rated to be used in a load-bearing structure and I simply wonder if they will hold, or if I should instead join two 2"x4" beams as posts.
I would preferably avoid the hassle of returning the existing beams and buying new ones since I don't have a car with a tow hitch.
The roof (corrugated plastic) will be 2 x 5.5 m where the long side will be attached to the house on a rafter and on the other side to the posts I bought. There will be 5 posts and the rafters will be spaced cc 50 and will have dimensions of 45x170.
I hope I've provided a somewhat reasonable description of my problem and that there is some helpful soul out there in cyberspace.
I am completely a novice in the noble art of construction and am now attempting to roof part of our porch. I hope that the brain trust here on byggahus can help me.
I have bought pressure-treated beams in the dimensions 95x95: https://www.beijerbygg.se/privat/sv...-46/95x95-impr-hyvl-klass-a-3-0m-880509509530
My idea was to use these as posts to support the entire structure. Now I've read up a bit, and they aren't rated to be used in a load-bearing structure and I simply wonder if they will hold, or if I should instead join two 2"x4" beams as posts.
I would preferably avoid the hassle of returning the existing beams and buying new ones since I don't have a car with a tow hitch.
The roof (corrugated plastic) will be 2 x 5.5 m where the long side will be attached to the house on a rafter and on the other side to the posts I bought. There will be 5 posts and the rafters will be spaced cc 50 and will have dimensions of 45x170.
I hope I've provided a somewhat reasonable description of my problem and that there is some helpful soul out there in cyberspace.
I am no expert, but I am convinced that it will hold. I myself have a canopy with 95x95 posts at the edge and a beam over which the rafters rest.
However, how many posts you need will have to be calculated by someone else.
However, how many posts you need will have to be calculated by someone else.
Member
· Blekinge
· 10 117 posts
Hello and welcome to Byggahus forum!
Your posts are not strength graded, but that doesn't mean they lack any load-bearing capacity. They are quality graded, which is always something. (G4-3, which corresponds to VI sorting. They contain too many knots to be suitable as construction lumber, which should be G4-0 - G4-2). With five posts at the front, the load per post will be at most around 300 kg if it is in the southern part of the country. They will definitely handle that.
Your posts are not strength graded, but that doesn't mean they lack any load-bearing capacity. They are quality graded, which is always something. (G4-3, which corresponds to VI sorting. They contain too many knots to be suitable as construction lumber, which should be G4-0 - G4-2). With five posts at the front, the load per post will be at most around 300 kg if it is in the southern part of the country. They will definitely handle that.
Many thanks for the quick responses!
I've decided to try to do as much right as I can. So I'll buy two reglar and put them together. That way, I won't have to think about it later.
The transport of the timber will work itself out. Fortunately, I have some friends with vehicles better suited for towing a trailer than a car without a tow hitch.
Naturally, a follow-up question arises. What's the best way to put two reglar together?
Nail? Screw? Glue? Zip tie? Gaffer tape?
Kids' slime?
Best wishes,
N.C.
I've decided to try to do as much right as I can. So I'll buy two reglar and put them together. That way, I won't have to think about it later.
The transport of the timber will work itself out. Fortunately, I have some friends with vehicles better suited for towing a trailer than a car without a tow hitch.
Naturally, a follow-up question arises. What's the best way to put two reglar together?
Nail? Screw? Glue? Zip tie? Gaffer tape?
Kids' slime?
Best wishes,
N.C.
Now hold on. Of course, you should continue on the current path and use these posts. This dimension is used all the time for precisely this. Go ahead and don't complicate things with some double-rule variant.
Thank you very much for all the input!
I am now convinced that the existing posts will do, and it will be both cheaper and a bit easier to integrate the beam with the solution using two joists.
I'll manage the small hassle with transportation.
I am now convinced that the existing posts will do, and it will be both cheaper and a bit easier to integrate the beam with the solution using two joists.
I'll manage the small hassle with transportation.
Member
· Stockholm
· 4 636 posts
Hello
Building is fun, isn't it
I agree that it's easier with 2 boards, go for it if that's what you're comfortable with.
95x95 looks nicer and is just as simple, provided you have the knowledge and tools, the right handsaw would suffice.
Upload a picture of your conditions and plans so we can better understand your thinking.
For instance, the attachment of the patio roof is a point where I've seen the most deficiencies, and that's where the snow load from the roof presses the hardest.
Building is fun, isn't it
I agree that it's easier with 2 boards, go for it if that's what you're comfortable with.
95x95 looks nicer and is just as simple, provided you have the knowledge and tools, the right handsaw would suffice.
Upload a picture of your conditions and plans so we can better understand your thinking.
For instance, the attachment of the patio roof is a point where I've seen the most deficiencies, and that's where the snow load from the roof presses the hardest.
Grundstött
· Halland
· 28 345 posts
Nail or screw! I assume tape and zip ties are meant humorously.N NoClues said:
Personally, I would screw with 5x80:

https://www.jula.se/catalog/bygg-oc...ostfria-skruvar/traskruvar/traskruvar-302341/
And I would also add some regular white glue of outdoor quality in between!
And good luck and welcome to the Bygg Hus forum NoClues!
I like your new word to taka in the patio
Which part of the country are you in?
Fun to build..well..I don’t really know how to respond. Right now I just feel like I'm digging myself deeper and deeper into a pit of uncertainty. As an office rat who hasn't seen untreated wood since woodshop class, it's quite a lot to take in. 
My first thought about putting a roof over the terrace: -"How hard can it be? A few planks and then a roof. Done in a jiffy."
Then you start digging and suddenly realize that you understand nothing at all.
-What wood?
-Impregnated?
-Are you going to paint the wood?
-Yes!
-Then you have to wait a year or two before painting.
-Oh... I guess I won’t paint then.
-And you also need the screw ultracarbongripperplus in dimensions n (where n stands for an infinite number of different dimensions).
...of course, the screw is nowhere to be found when you go shopping. So you're back to square one.
Etc....
Thanks Workingclasshero!
My vocabulary will be expanded with an enormous amount of new words.
I’ve put down my posts...ehh...future posts...of two beams...in the Stockholm region.
My first thought about putting a roof over the terrace: -"How hard can it be? A few planks and then a roof. Done in a jiffy."
Then you start digging and suddenly realize that you understand nothing at all.
-What wood?
-Impregnated?
-Are you going to paint the wood?
-Yes!
-Then you have to wait a year or two before painting.
-Oh... I guess I won’t paint then.
-And you also need the screw ultracarbongripperplus in dimensions n (where n stands for an infinite number of different dimensions).
...of course, the screw is nowhere to be found when you go shopping. So you're back to square one.
Etc....
Oh! Another thing I hadn't thought about. Or yes, I have thought, but probably wrong. I was just thinking of putting up the rafters with a steel angle (is it called that?) against the overhanging roof from the house. But on further thought, that's probably not a good idea. I probably need to find a beam in the roof to attach them to...somehowWorkingclasshero said:
Thanks Workingclasshero!
Well, tape and cable ties were a bit on the humorous side. Easy to forget that irony isn’t so easy in writing.KnockOnWood said:
You’re absolutely right. It’s a very strange expression, but maybe it clarifies my ignoranceKnockOnWood said:
I’ve put down my posts...ehh...future posts...of two beams...in the Stockholm region.
Love this post 😄N NoClues said:Fun to build...well...I don't really know what to say. Right now I'm just digging myself deeper into a pit of uncertainty I feel. As an office worker who hasn't seen untreated wood since woodworking class, there's quite a lot to take in.
My first thought about putting a roof over the patio: -"How hard can it be? A few planks and then a roof. Done in no time."
Then you start investigating and suddenly realize that you don't understand anything at all.
-What wood?
-Treated?
-Are you going to paint the wood?
-Yes!
-Then you have to wait a year or two to paint it.
-Oh...Then I won't paint it.
-Also you need the screw ultracarbongripperplus in sizes n (where n stands for an infinite number of different dimensions).
...of course, the screw is nowhere to be found when you go shopping. So you're back to square one.
etc....
Look at that! Another thing I hadn't thought of. Or yes, I've thought about it, but probably incorrectly. I just thought to put up the rafters with an angle bracket (is that what it's called?) against the protruding roof from the house. But on second thought, it's probably not a good idea. Probably need to find a beam in the roof to attach them to...somehow
Thank you Workingclasshero!
Yes, the tape and zip ties were somewhat on the humorous side. Easy to forget that irony isn't so easy in writing.
You are absolutely right. It's a very strange expression, but maybe it clarifies my ignoranceMy vocabulary will expand with huge amounts of new words.
I have knocked down my posts...ehh...future posts...of two beams...in the Stockholm area.
I'm planning to build a patio roof myself with 95x95 "posts" I was thinking. How did your roof turn out?
Hi!N Nina1978 said:
This was a while ago! 🙂
Well, the roof turned out well, but I decided to go with 2"4 beams instead. It was simpler and doesn't risk twisting were the arguments for two beams.
Good luck with your build!
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