A few years ago, I built a fence with untreated wood painted with Falu red paint.

Now it's time to build a gate and mount gate posts. For the gate, we have an older two-part forged gate that we plan to attach to slightly thicker wooden posts. This is my problem.

The massive posts available for a reasonable price are in too small a dimension (90x90), and I need at least 120x120.

I was recommended at a building store to make the posts from a glulam beam 150x150…

Are there any disadvantages to this?
Can such a beam withstand outdoor conditions?

The idea is also to paint the posts with Falu red paint.
 
  • A laminated wooden beam with visible grain and markings, wrapped partially in black plastic, possibly intended for outdoor gateposts.
You can compare the prices of laminated beams versus making your own. 3 pieces of 145 X 45 that are glued with outdoor glue and screwed together and clamps that hold them together in the meantime. First clamp together 2 and then a 3rd. Make sure to turn them so that the growth rings are not aligned in the same direction. How have you planned to anchor them in the ground?
 
They will be anchored by casting footings with flat iron that will be screwed into the post. The posts will therefore not have contact with the ground.

I prefer to buy ready-made even if it is likely more expensive. It needs to be two posts, and then the price per post from the store is just over 300.

Not the price I'm worried about, but rather the durability for outdoor use :)
 
If 115x115 is sufficient, there is a printed glulam post. I myself have these as weather-exposed posts. Red paint may have difficulty adhering, so it's advisable to roughen the surface with coarse sandpaper.
 
C coolakolan said:
They will be anchored by casting footings with flat iron that will be screwed into the post. The posts will not have contact with the ground.

I would prefer to buy ready-made even though it is likely more expensive. It needs to be two posts, and then the price per post from the store is just over 300.

So I am not worried about the price but rather the durability for outdoor use :)
No risk at all, a 45X95 that is one meter and can be held perfectly plumb, can support a small car.
 
Strength was probably not the word I actually meant but rather durability. Will a painted glulam beam withstand the weather and wind without taking damage?
 
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C coolakolan said:
Strength wasn't really the word I meant but rather durability. Will a painted glued laminated beam withstand outdoor weather without getting damaged?
No problem at all. Choose a paint system and try to keep it a bit off the ground, and there will be no issues. However, distemper is not recommended, but something like oil stain is.
 
Why is not "slamfärg" recommended?
The wife probably wants it to match the rest of the fence :)
 
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Poor protection for the wood in it. You should have something to protect the glue that binds the Glulam beams together. There are, of course, paints that resemble Falu but possess significantly better properties in terms of protecting the wood.
 
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