Can you use impregnated planks as a wind board?

[Ironside]

Hello,

Both fascia boards on our patio are rotten, which means that some nails holding the wavy plastic roof are loose. Currently, there is a regular painted fascia board on each side:


This is not our patio, but we have a similar one. In this case, it's the fascia board that goes along the top of the roof, and in our case, there is no metal to protect it; the last wave of the plastic roof lies over the fascia board as protection. I have noted that the plastic roof has cracked 1 cm or so in a couple of places when the ladder was placed against the edge, but I think the problem mainly arose because the nails holding the roof allowed water in.

There are plans to renovate the patio in about 5 years, so it's not very interesting to make this a big job (i.e., oiling, priming, and painting the fascia boards). So now we're considering if we could use a fascia board made of pressure-treated wood instead. If desired, it should be possible to paint it after 1-2 years when the wood has dried. But as I understand it, you generally shouldn't use treated wood on residential buildings, so what should we consider here?

It can be mentioned that the worst side is also where it is most windy and rainy.

 

[fribygg]

Sure, you can use an impregnated board on the exterior of the building if you want to.

 

[Huddingebo]

Agree with the above
However, one should wait a year before repainting if they want to ensure that the paint stays.

 

[z_bumbi]

It's enough to wait until the wood is dry enough.

 

[AndersS]

Or regular timber, but then you choose 28 mm for the wind boards and not the usually thin panel timber 21 mm.
There's a big difference in stability and durability.

 

[pacman42]

But if it is to be redone within five years, then impregnerated is not needed.

 

[epw]

There are boards that are primed and painted once. They last without problems for five years if you don't manage to paint once on site. Impregnated wood is not made to be painted, regardless of whether it's been one or two years.