How to fill gap in bearer deck substructure?

[Frank2024]

I am using two pieces of  90x45 timber to make bearer. There is gap between two timbers binded by screws. Can normal external gap filler prevent wood rot ? Is there any better way ? Or leave as it is?

[Jewelleryrescue]

Hi @Frank2024

For  sure  you can seal that gap  with  external gap filler.  I would  also  paint the sub structure with  paint as a  moisture barrier if you are concerned it will  get wet or other.  But if Bearers  get wet often is a big  problem other wise no real sealing  required at all under normal circumstances.

Timber  really needs  sealing all round and especially at the end cuts to defend against wood rot which is usually speed up by water contact.

So I hope this  general outline helps your situation.

Feel  freeto  talk more of you have new  questions.

[EricL]

Hello @Frank2024 

I suggest covering the surface of the bearer with CAgroup 50mm x 20m Bearer Protector G-Tape. Put one in the centre to cover the gap and then cover the sides with more tape. There is no need to put tape at the sides or bottom of the bearer.

It sounds like you're building a deck, would it be possible for you to post a photo update? I'm sure our members will be keen to see the type of deck you're building.

If you need further assistance, please let us know. 

Eric

[evisbal]

Hi @EricL, I have a similar situation here.

I laminated two 4.2m, 140 x 45 members to create the bearer using a nail gun [75 x 3.06], but then I noticed there was a gap that extends for around 30 cm or so. Will the solution above be enough to prevent water to come through? also, is there any risk this get separated in the future because of this gap?

I've also seen many videos where people use timber sealant/waterproof when a cut is made, so I asked different people in the Bunnings shop, who said if the timber is treated [in this case, H3], then there's no need to use any product. Could you please confirm this?

Thanks.!

[EricL]

Hello @evisbal 

Thanks for sharing your question about your timber bearer. The purpose of the CAgroup 50mm x 20m Bearer Protector G-Tape is to prevent water from sitting on the surface of the timber. This helps the timber from getting bogged with water. Treated timber such as H3 and H4 are exposed to chemicals that protects them from both insect attack and exposure to the weather. 

However, any extra protection you can provide will definitely help with the timber's lifespan. You mentioned that you fixed the two pieces of timber with nails. I suggest reinforcing that with a nut and bolt assembly as this would be a stronger way to secure the two pieces of timber together. 

The only other form of protection I can propose is using Gripset Betta 1L Waterproofing Membrane Bitumen Rubber. However, it's important that the timber be seasoned properly before applying the bitumen. This means that the timber is not sweating any oils, tannins or chemicals from its surface. 

Please make sure to wear personal protection such as gloves, goggles and a mask when working on your project.

If you have any other questions I can help with, please let us know.

Eric