Otter ground screws

[jays2007]

Hi guys, anyone had any experience with the otter ground screws? Was looking at these as an option for ground level deck...

https://www.bunnings.com.au/otter-690-x-90mm-ground-screw-stirrup_p0084143?gclid=Cj0KCQiAuefvBRDXARI...

[Brad]

Looks interesting, I haven't seen them before and being a serial offender in not driving screws in straight I wonder how easy they are to get lined up straight?

[ProjectPete]

I don't have experience with these @jays2007 but depending on your soil type, I'd suggest being conscious of their sturdiness over time.

90x90 or 100x100 H4 stumps concreted into the ground is your best bet IMO - tried and tested. Cheaper than those too.

Stump/post goes 300mm into the ground (so approx 450-550mm total length) and set with rapid set concrete. It'll cost approx $16 per post inc concrete.

[jays2007]

Thanks @ProjectPete. My soil is reactive clay soil, what sort of depth would you suggest for concrete/stumps?

[ProjectPete · Accepted solution]

If you go with the H4 treated pine stumps/posts, just dig a hole that's 400mm deep and set the stump/post 300mm into the ground/hole leaving 100mm below it for concrete. The diameter of your hole should be: Width of post + 250mm (+300mm even better).

Remember to allow enough stump for bearer, etc to attach to. Always better to cut it longer than needed to allow for any miscalculations/movements - you can always trim any excess with recip saw, handsaw or even just a planer. Hope that makes sense @jays2007 

[TheSaltyreefer]

HI mate
We sell quite a few of these, best application so far has been for temp work and or rentals, but have seen a few perm structures where these have been set in.

[HandyAndy]

have been looking into these, another brand in particular, started in Scandinavia and is becoming internationally used for anything from small decks to large scale construction.

they have a design/engineer team, and an install team, from what I've seen, its very cost effective, particularly when you have alot of holes.

I probably wouldn't attempt it on my own though and would prefer a professional to design & perhaps even install.

looks like they might be good for clay.

if it was maybe 1 or 2 for a semi permanent structure i would maybe have a go.