Impregnated post and board?

[blork]

I am going to rebuild my fence a bit and need to install 2 new posts (70x70) and a few more planks (22x145). Currently, the fence is white and I plan to paint my new section white as well. However, I am a bit confused about material choices. Planks are available in plain untreated pine but also pressure-treated. The posts themselves only seem to be available in pressure-treated.

If I take the pressure-treated posts and planks, can they be painted white afterwards? Do they need to be primed or base-oiled then? Or should I take only pressure-treated posts and untreated planks? Which would be best, do you think?

 

[Testarn]

It is quite common for pressure-treated wood to be quite wet, so if you paint them immediately, the paint adheres poorly and can trap moisture, which creates problems in the long run. It is common to wait a couple of years before painting treated wood so it has time to dry, and some of the impregnating liquid has time to leach out for the paint to adhere properly. You should always prime before applying the finish coat. The primer has different technical properties than the topcoat and adheres better to the substrate, etc.

Posts in 70x70 that are not impregnated are usually made of glulam, and I don't know if they are classified for outdoor use. You should ask the dealer about that.

If you're going to paint, I would use untreated boards and preferably paint them before putting them up to make it easier and to get paint around all sides properly.

 

[blork]

It is quite common for pressure-treated wood to be quite wet, so if you paint it right away, the paint adheres poorly and can trap moisture, causing problems in the long run. It is common to wait a couple of years before painting treated wood to let it dry and for some of the impregnation fluid to leach out so that the paint will adhere properly. You should always use a primer before the final coat of paint. Primer has different technical properties than topcoat and adheres better to the substrate, etc.

Posts in 70x70 that are not impregnated are usually made of laminated wood, and I don't know if they are rated for outdoor use. You should ask the dealer about it.

If you are painting, I would choose untreated boards and preferably paint them before putting them up to make it easier and get paint around all sides properly.

It won't look good with painted boards and then two treated posts for 1-2 years. 🤣

 

[Fällebyggarn]

It won't look sensible with painted boards and then two pressure-treated posts for 1-2 years. 🤣

You get used to it and suddenly the posts have been there for 15 years and no one has painted them..

If the hardware store doesn't have them, find a sawmill that can give you what you want, so you can paint now.

 

[Pjosk75]

Untreated 70x70 studs are available at Byggmax, for example.

 

[blork]

Unfinished 70x70 studs are available at Byggmax for example.

Hmm yes, they do have them, that's what it'll be then. 😆