Wood Preserver

Hi,

We are renovating a wooden porch and retro fitting upvc windows and door, but retaining the tiled roof which has some 3x3" posts supporting it.
These posts are rotting and will need replacing along with some other wooden areas but they will be up against the new upvc.

Will a wood preserver, probably Ronseals Total, once fully dried, affect or discolour the upvc in any way ?

We will also be making some wood joints and using typical wood glue and screws but again wonder if using a preserver on the wood either before or after glueing will affect the wood glue ?

Have put the point direct to the makers but no response in over a week.

Puzzled? How can wood treatment affect plastic in the vicinity ?

No & No unless of course you brush the preservative directly onto the upvc frames then Yes.

You say you are replacing some wooden posts.

After cutting them to size, and doing any planing, chiselling or trimming, and befire assembky,stand each end in a pot of preserver so it soaks up into the end grain, preferably for more than 24 hours. Then brush several wet coats onto all other surfaces. The end grain, and defects such as knots, are where water will get in and creat the damp where insects and fungi thrive.

You cannot treat timber effectively after build.

Leave them to dry. Wear gloves until they have finished drying.

Build so that timber is not standing on a wet surface and so rain cannot run down it and soak into the ends.

The older, very effective presevers such as Cuprinol Green seem no longer to be available, I suppose because they were intentionally poisonous to insects and fungi and therefore hazardous to the environment.

Beware that some decorative wood treatments are incorrectly sold as "preservers" for example at Toolstation. If you read the COSH documents and compare them to the label on the container you can verify that they contain the (hazardous) chemicals necessary. The online descriptions are not reliable.