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Exterior Joinery Repairs & Maintenance

Part 1 of our new regular weekly feature, where we bring you common property maintenance issues, and how best to solve them to help extend the life of your property & assets.


One of the regular calls we get within the residential property maintenance clients, concerns exterior timber joinery rot (windows, French doors, louvres etc.), and with these sorts of jobs the fix or remedy depends on multiple factors, which we will discuss below, along with the common causes & how to minimise these risks, and the range of recommended fixes, depending on budget/expectations. We have a recent case study attached below as well, on a country cottage in Karaka where extensive exterior timber joinery repairs were undertaken by our team.


Now the causes of rot to timber joinery can be from a multitude of factors, either:

- Insufficient clearance from the ground/concrete

- Insufficient paint maintenance, as paint is the first line of defence against water ingress into timber

- General lack of joinery maintenance over an extended period of time, along with insufficient eaves/soffits.


The solution to the problem depends on the specific joinery in question, as there are a couple of factors which will determine the recommended course of action:

1 - The extent of the rot - this is usually only known fully once invasive investigation has taken place (scraping back the rot to find how far up until we hit solid timber)

2 - If the rot is clearly consuming the whole piece of joinery, this is the point a complete replacement will be recommended. This is the most expensive option obviously, but in some cases is the only option unfortunately

3 - If the rot is at the level of repair, then the standard method of fixing requires removal of the door/window, with repairs carried out onsite.


The doors/windows are fully scraped back, to remove all the visible rot through to where it returns to solid timber. The exposed timber is then treated with a product called Metelex, which is a timber treatment product that prevents future timber rot & decay. Following this, we screw a new block of timber into the current cavity, and use a marine grade epoxy resin to completely fill up the cavity. After the resin has hardened completely, usually 48 hours, we will sand back until all is flush with the surface of the doors, and then re-attach the door to the frame.






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