Hi!
I'm planning to build a deck on the gable of the house, which is 8.6 meters long.
The deck will be about 4-5 meters wide/deep, and this is where I'm wondering what depth is most optimal considering the number of support beams.
The plan is to attach a support beam to the house (if possible, otherwise a footing very close to the house) and maybe 1-2-3 rows more with support beams in the same direction as the gable of the house.
Then you'll place 45x145 floor joists "across" these with cc600, and on this, the decking 28x120.
I have seen that XL Bygg has 45x145 in lengths 4.2 and 4.8 meters. Assuming these dimensions are the basis for the deck's depth, how many support beams will be needed if the dimension of the support beam is 45x195 and approximately how close should the footings be?
I'm planning to build a deck on the gable of the house, which is 8.6 meters long.
The deck will be about 4-5 meters wide/deep, and this is where I'm wondering what depth is most optimal considering the number of support beams.
The plan is to attach a support beam to the house (if possible, otherwise a footing very close to the house) and maybe 1-2-3 rows more with support beams in the same direction as the gable of the house.
Then you'll place 45x145 floor joists "across" these with cc600, and on this, the decking 28x120.
I have seen that XL Bygg has 45x145 in lengths 4.2 and 4.8 meters. Assuming these dimensions are the basis for the deck's depth, how many support beams will be needed if the dimension of the support beam is 45x195 and approximately how close should the footings be?
Two rows of blocks and one bearer on the house are enough. The first bearer is 2.25 m from the wall and the second one is 4.5 m. Then you can extend the floor joists 50 cm beyond the last bearer if you want it 5 m wide.
If the plan is to use 195 and 145 as joists and you can manage height-wise, a 45x145 C24 can handle an open span of 2.28m. C14 is a bit shorter at 1.74m.
If the deck will be 5 meters deep, you can manage with one beam in the wall and two more if you use 45x145 C24 with a little overhang outside the outermost beam.
195 as a beam only gives longer distances between posts - You can choose thinner wood with closer spans between posts - Personally, I like to over-dimension, and mine is set with 195 beams and 120 joists - But then I only have about 1.7m between the beams and the span of a 120 C24 is a full 1.93m.
If the deck will be 5 meters deep, you can manage with one beam in the wall and two more if you use 45x145 C24 with a little overhang outside the outermost beam.
195 as a beam only gives longer distances between posts - You can choose thinner wood with closer spans between posts - Personally, I like to over-dimension, and mine is set with 195 beams and 120 joists - But then I only have about 1.7m between the beams and the span of a 120 C24 is a full 1.93m.
is this calculated with 45x195 as support beams then?huggan said:
how close should the posts be under these support beams?
I probably need to install posts also closest to the house, so the fewer posts per meter the better (so if there's an advantage to using thicker support beams, I'll do that)
that is the plan to use these dimensions, but if other dimensions are more advantageous, I am flexible!slacker said:
I have the height space, about 70-80 cm I guess (and also an excavator
)so figuring out what becomes "cheapest" is really what this thread should be called
Depending on the solution, I find it easier to attach the bärlina to the sill, partly because my foundation posts would have interfered with the drainage. If you attach it to the sill, you should be careful with drainage to avoid water pressure against the sill.
The calculation is actually independent of the type of bärlina when you look at the joists - it is the distance between the bärlinor that dictates - Thus, the choice of bärlina comes in when you want to know how close (or far apart) you want the foundation posts to be. A 45x195 C24 has a free span of 3.07m so you don’t need to have them very close together under a 195 of that class. A 45x195 C14, on the other hand, can only handle a 2.34m free span, so it depends on the choice of timber.
The calculation is actually independent of the type of bärlina when you look at the joists - it is the distance between the bärlinor that dictates - Thus, the choice of bärlina comes in when you want to know how close (or far apart) you want the foundation posts to be. A 45x195 C24 has a free span of 3.07m so you don’t need to have them very close together under a 195 of that class. A 45x195 C14, on the other hand, can only handle a 2.34m free span, so it depends on the choice of timber.
Can recommend an app for the phone called "Svensk Trä" - download it and start tapping to get a clearer picture.
In general, closer spacing between support beams = smaller joists.
You will need the most joists, so it may definitely be worth adding an extra support beam and reducing the dimensions of the joists, the only downside is the digging....
EDIT: Also found this: http://www.byggbeskrivningar.se/altan
In general, closer spacing between support beams = smaller joists.
You will need the most joists, so it may definitely be worth adding an extra support beam and reducing the dimensions of the joists, the only downside is the digging....
EDIT: Also found this: http://www.byggbeskrivningar.se/altan
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Have looked a bit at the sizing and concluded that the floor joists will be 45x145 and the support beams will be 45x195 at about 2.2 meters apart from each other. But I haven't found anywhere how closely the ground supports should be placed under the 45x195 support beam. Does anyone know the maximum distance?
Oh oh, you have answered that slacker.. Is it 3.07 meters then? That sounds long to me..
If my terrace becomes 8.4 meters long, do I manage with 4 plinths per beam?
So 12 plinths in total if I can't attach anything to the wall?
If my terrace becomes 8.4 meters long, do I manage with 4 plinths per beam?
So 12 plinths in total if I can't attach anything to the wall?
The principle is the same as for a beam and the same as you see in the program - Free span also applies to bearers, so in theory 3.07m between the pillars on a 45x195 C24 would be sufficient. Despite this, I would set them closer together just to be on the safe side; I think mine are about 2.3-2.4 meters apart under a 195 bearer. I chose to shorten the distance between the bearers as well since I have a shorter deck and could therefore choose a 120 framework with 2 sections.
4 more pillars on your 12 won't make the deck much more expensive... Screws are what really cost a lot!
Mine has been tested with 32 people in any case!
4 more pillars on your 12 won't make the deck much more expensive... Screws are what really cost a lot!
Mine has been tested with 32 people in any case!
Thanks for the good answer!
If the deck is 8.4 meters, the post spacing will be 2.8 meters for 4 per bearer and 2.1 meters for 5 posts per bearer.
Does 2.8 feel a bit on the edge? I mean c24 vs c14 isn’t always reliable with the marking...
If the deck is 8.4 meters, the post spacing will be 2.8 meters for 4 per bearer and 2.1 meters for 5 posts per bearer.
Does 2.8 feel a bit on the edge? I mean c24 vs c14 isn’t always reliable with the marking...
Check the beam lengths as well - A joint on the support beam in the middle between two posts I see as a pretty bad solution. Mine are jointed in the middle of the posts and generally how I usually build decks.camaro1969 said:
I also like to move the outermost support beam in and move the posts at the ends of the support beam to get a nicer appearance for the entire deck.
I'll also take the opportunity to mention something I've written a few times before regarding the posts - The best option, in my opinion, is to take 45x95 or 45x120 for posts and set them according to a tip in another thread:
https://www.byggahus.se/forum/altan-uteplats/235913-nytt-hus-ska-fa-ny-altan.html?perpage=30#post2014142