# Hybrid wikihouse floor and wall system plus Light Gauge steel roof? **URL:** \ **Category:** Designing with Skylark\ **Created:** [26 September 2026 07:28 UTC](https://community.wikihouse.cc/t/hybrid-wikihouse-floor-and-wall-system-plus-light-gauge-steel-roof/1555 "2026-09-26T07:28:19Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![chrispez](https://community.wikihouse.cc/letter_avatar_proxy/v4/letter/c/3ec8ea/32.png) [@chrispez](https://community.wikihouse.cc/u/chrispez)\ **Post date:** [26 September 2026 07:28 UTC](https://community.wikihouse.cc/t/hybrid-wikihouse-floor-and-wall-system-plus-light-gauge-steel-roof/1555/1 "2026-09-26T07:28:20Z")
Hi team, Would any structural engineers familiar with either light gauge steel or wikihouse have any thoughts on combining the typical wikihouse plywood floor and wall block system with a light gauge steel roof over the top? (Usual straps and tie down rods integrated). Thought this hybrid wikihouse and light gauge steel roof that makes hip roofing easy might make sense for cyclonic / typhoon wind load areas, where a hip roof design performs better under those high wind loads than the default gable/flat/skillion wikihouse roof? How to approach this given structural engineers might not be familiar with calculations for the wikihouse system? System would be required for cylonic areas in northern Australia or South East Asia. Have been led down this hybrid path as there is currently no hipped roof block system for wikihouse. Look forward to any thoughts or feedback. Cheers, Chris. ---
**Author:** ![lachlan](https://community.wikihouse.cc/user_avatar/community.wikihouse.cc/lachlan/32/57_2.png) [@lachlan](https://community.wikihouse.cc/u/lachlan)\ **Post date:** [24 October 2026 02:02 UTC](https://community.wikihouse.cc/t/hybrid-wikihouse-floor-and-wall-system-plus-light-gauge-steel-roof/1555/2 "2026-10-24T02:02:53Z")
We use Wikihouse Floor and Wall blocks and then a truss roof, so its likely similar to do a LGS roof. We use a modified wall block and run a top plate around the perimeter that the truss gets affixed to. Underneath the top nog you see there we install 90x45 timber blocking either side with 3/14gx124mm screws and screw the top plate down with 2/10gx100mm screws on either ![Screenshot 2026-10-24 at 3.02.26 PM](https://wikihouse-community-discourse-files.s3.dualstack.eu-west-2.amazonaws.com/original/2X/d/d53f3e24a0134c19ae10fcfe4defdb9855ad8ffc.png) ![Screenshot 2026-10-24 at 3.00.35 PM](https://wikihouse-community-discourse-files.s3.dualstack.eu-west-2.amazonaws.com/original/2X/5/500a49f3e32804e8b31eb0b3fc61f6d3fadc7de0.jpeg) ---
**Author:** ![chrispez](https://community.wikihouse.cc/letter_avatar_proxy/v4/letter/c/3ec8ea/32.png) [@chrispez](https://community.wikihouse.cc/u/chrispez)\ **Post date:** [24 October 2026 05:54 UTC](https://community.wikihouse.cc/t/hybrid-wikihouse-floor-and-wall-system-plus-light-gauge-steel-roof/1555/3 "2026-10-24T05:54:23Z")
Hi Lachlan, That’s amazing info, thanks for sharing that mate! You’ve basically confirmed for us that the lgs hybrid roof is possible in tandem with the wikihouse wall system as the lgs can come in similar dimensions to a timber truss system. Would you happen to still be in touch with or be able to recommend another structural engineer with similar knowledge of your system, anyone who can do structural calcs for the truss roof / wikihouse wall combo similar to like you did? Kind Regards, Chris. ---
**Author:** ![chrispez](https://community.wikihouse.cc/letter_avatar_proxy/v4/letter/c/3ec8ea/32.png) [@chrispez](https://community.wikihouse.cc/u/chrispez)\ **Post date:** [24 October 2026 06:15 UTC](https://community.wikihouse.cc/t/hybrid-wikihouse-floor-and-wall-system-plus-light-gauge-steel-roof/1555/4 "2026-10-24T06:15:14Z")
Also, is the modified wall block just a notch for the 140x45 top plate to pass through the top of the wall block? Cheers. ---
**Author:** ![lachlan](https://community.wikihouse.cc/user_avatar/community.wikihouse.cc/lachlan/32/57_2.png) [@lachlan](https://community.wikihouse.cc/u/lachlan)\ **Post date:** [24 October 2026 06:59 UTC](https://community.wikihouse.cc/t/hybrid-wikihouse-floor-and-wall-system-plus-light-gauge-steel-roof/1555/5 "2026-10-24T06:59:41Z")
Hi Chris, Absolutely - it’s PTL [https://ptlnz.com/](https://ptlnz.com/). Yes - exactly that. We have a different top plate configuration for lintels around windows too. When interior frames butt up against that top plate we just use a standard Mitek top plate fixing as well. Out of curiousity, any reason why you prefer LGS over say a Bunnings Frame and Truss? ---
**Author:** ![chrispez](https://community.wikihouse.cc/letter_avatar_proxy/v4/letter/c/3ec8ea/32.png) [@chrispez](https://community.wikihouse.cc/u/chrispez)\ **Post date:** [24 October 2026 07:35 UTC](https://community.wikihouse.cc/t/hybrid-wikihouse-floor-and-wall-system-plus-light-gauge-steel-roof/1555/6 "2026-10-24T07:35:29Z")
(post deleted by author) ---
**Author:** ![chrispez](https://community.wikihouse.cc/letter_avatar_proxy/v4/letter/c/3ec8ea/32.png) [@chrispez](https://community.wikihouse.cc/u/chrispez)\ **Post date:** [24 October 2026 07:36 UTC](https://community.wikihouse.cc/t/hybrid-wikihouse-floor-and-wall-system-plus-light-gauge-steel-roof/1555/7 "2026-10-24T07:36:16Z")
Hi Lachlan, Much appreciated mate! Thanks for sharing and all the info such a big help. For our constructions in Aus we would absolutely go for a Bunnings Frame and Truss, LGS preference is for South East Asia purely for supply and dimension availability as pre-fabricated basic timber trusses are harder to come by in Aus/NZ style dimensions in that region, whereas LGS framing in that region is output from machines in the same dimension as global which is basically identical to timber/lgs framing dimensions and standards from Aus/NZ.