Screws for fencing

[Daddy Boots]

Building a 16.5m long trellis to sit 90cm above a 1m brick wall. Spaced at 1.8m the 1.8m x70mm square posts will be fixed to the wall and the trellis will be fixed to the upper 90cm of the posts leaving the lower wall exposed. The trellis is made of planed , pressure treated square edge 20x45mm battens. There will be a vertical batten fixed to the horizontals 1/2 way between the vertical posts to reduce flexing. I'd like as little head as possible showing on the battens. Which screws should I be using for the batten to batten and which for batten to post ? How should the 70mm posts be fixed to the wall?

 

[Deluks]

How deep does the wall foundation go, if it were me, I'd be wanting some of the post into the ground.
I'd probably choose angle iron for the posts.

But continuing as you are, you could use bolts into the wall and through the post. Resin type or expanding rawlbolts.
Concrete screws with a torx head would also work, but it's a lot of piloting and screwing and getting everything lined up.

Alternatively you could fix a heavy duty right angle bracket into the wall using standard wall plugs, and screw through the side of the bracket into the post.


For the battens, use galvanised lost head nails. Pilot holes if hammering, or use nail gun.
Screws will look shoite, you could use a lost head decking screw, but that could get pricey, and look shoite.

 

[Daddy Boots]

Thanks. The wall circa early 1900's lime mortar has been completely rebuilt and now has footings. Looks are important so it has to be posts rather than brackets. Given the surroundings I don't expect much wind stress.

 

[Deluks]

Any pillars?

 

[Daddy Boots]

No pillars. Built in 3 sections with 2 gaps to alleviate cracking.

 

[Munroast]

be careful using expanding rawl type bolts on that wall, to close to the edge and it may just crack a brick off - a hole all the way through with a big washer on the other side would be better

the battons in you 'fence' picture look a lot bigger than 20*45 ?

I used screws on 35x4 steel crews on my trelliis (20x45 rough sawn) - doesnt look good the day after, but give it 6 moths and the heads get a bit rusty and the wood gets a bit coloured and you would never notice them

I think @Deluks is right above with lost head galv nails (twist ones) if hammering, piolet hole and someone at other side holding sledge hammer against the other side

 

[aveatry]

Go for stainless steel screws - or ringshank nails.