External wooden joint

Joined
18 Aug 2010
Messages
18
Reaction score
0
Location
Stirlingshire
Country
United Kingdom
I am replacing a small section of a wooden window frame (about 10 inches) I have copied the part quite accurately but wondering about the left and right sides should I pack the sides with 2 part filler then insert the `new part` to get a good seal before painting.
As it stands the gap would be approx 1 mm either side but I could widen that if better for the filler to adhere.
I also read sawdust & wood glue as an alternative.

Suggestions?
 
Sponsored Links
Joined
15 Sep 2017
Messages
28,906
Reaction score
2,135
Location
S. Uplands
Country
United Kingdom
If you want a long term joint, I’d use MS polymer or polyurethane mastic.

sikaflex is one brand, sold in screwfix.

it won’t sand flat like 2 pack, but it’s flexible so will last a long time and it’s paintable unlike silicone.

2 pack will give you a perfect invisible joint, but will crack eventually
 
Joined
16 Jun 2006
Messages
6,270
Reaction score
1,123
Location
London
Country
United Kingdom
MS polymers are a good shout. A better (sandable) option would be epoxy resin filler. They aren't cheap though and most require a special skeleton gun to dispense them before you mix them. RepairCare however do sell one that will work in a regular gun.

https://www.brewers.co.uk/product/NC940512

40 quid though

As Notch7 says, regular 2 pack is likely to crack and let water in. Epoxy is slightly flexible and designed specifically for the task.

Personally, I normally use the TimbaBuild epoxy resins. I have used RepairCare in the past but TimbaBuild is about 30% cheaper. Both are good brands though.

If cost is a factor, polyurethane glue (Gorilla, etc) should provide a decent seal (provided that your joints are pretty tight). It expands as it cures but is easy to sand back. The MS polymers recommended by Notch7 have far better gap filling properties and if the joins are not load bearing, will be fine. The downside is that you will see the glue line. Oh, and if you do use them, paint them with water based primer first. Oil based paints remain tacky when painted straight over them.
 

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
Sponsored Links
Top