How to repair rot on back door frame?

Bigempty2025

I was wondering how hard it might be for a amaoto repair some rotting wood at the end of the door frame.

Tbrr is about 3 cms where you can feel it's rotten on the wood going up the side of the door.  The rest of the wood on the bottom of the door and the door itself feels OK. 

Thanks in advance. 

JacobZ

Hi @Bigempty2025,

Thank you for reaching out for assistance with the rot at the base of your external architraves.

If the rot is not to the point where the timber is like cardboard and will fall apart when pressed, then the simplest solution is to apply a wood hardener to the affected timber, allow it to soak in and harden the timber, then paint over the top with a suitable exterior paint.

If the rot is more severe, then I'd suggest you use a multitool to cut out the rotted section of timber and replace it with a matching H3-treated timber trim that is cut down to fit in the gap and then secured in place with a few finish nails. If you can measure the width and depth of the timber and advise if that inside edge is square or slightly angled, I could certainly recommend a profile of timber to match.

If you need to cut out and replace the timber, the seam between the old and new timber can be filled with No More Gaps Exterior Gap Filler, smoothed and then painted over. Before installing, the end grain of the timber should also be sealed with some exterior paint as this will help prevent the recurrence of rot.

With either of these repairs, I would then suggest you apply a bead of silicone around the base of the timber, as the reason it has rotted is that water that is sitting on the decking boards has gotten under it and has wicked up through the end grain of the timber. Applying a bead of silicone at the base of the timber will help to prevent this water from finding its way into the end grain of the timber in future.

Let me know what you think and if you have any further questions, please don't hesitate to ask.

Jacob