Polystyrene floors?

[Grumble]

I have a self supporting building. Steel framing supported by screw piles. So the floor only has to carry the live internal load and the dead load of the fitout.

Aiming at 50psf, so it could support a car too.

I am wondering whether a damp proof membrane on the cleared and level ground with 200mm EPS blocks on top ((8" thick, 1m square, 40" x 40"). Blocks glued to each other.

Membrane up the sides and a second membrane on top. Ground treated timber perimeter frame.

Then 20mm (7/8") OSB tongue and grooved boards on top (Glued joints).

Obviously, expansion joints to the internal wall lining.

Finished floor is then 220mm (Nearly 9") above the ground.

No services or penetrations.

Thanks

 

[north star]

> > > >

9 inches seems like not enough room for underfloor
moving around………Are there any utilities under
the floor ( e. g. - elec. conduit, any type of piping, any
comm. cables or anything else that will require servicing \
inspecting \ modifying in the future ) ?

While “ no services or penetrations” now, I am considering
the future………Also, will this underfloor space be ventilated
or be conditioned ?…………I’m considering your proposed
ground treated wood framing for the long term.

< < < <

 

[classicT]

Are you thinking something like this? Image is linked to article.

 

[Grumble]

ALL: Where I am uses metric measurements, so my imperial conversions are 'Close' not exact.

Code requires a minimum distance above ground of 225mm (9") for the floor when building slab on grade here. Most slabs here are turn down concrete on crushed stone with a ton of steel.

The ceiling is 10-14' from the floor, so I will run services through this space (Like a commercial building). and through internal walls. I have remote controlled LED lights, so no need for light switches (They are individual portable remote controls). Mains power will either be in the internal walls or using trunking instead of skirting.

North Star - This is to be slab on grade with no crawlspace. The climate is 'Temperate' (Never hits 30f and can hit 100f) and this will be a single level house. The MHRV will provide all indoor air as the windows are all sealed, triple glazed units. All services are external to the building and enter through the wall rather than the floor. Keeping it as simple as possible to cut costs and build fast. This achieves an indoor ambient temperature of 20c/70f 24/7 without heating (Occupants make enough heat and minimum will be about 60f when empty).

We have an EPS product called "Tuff / Solid pods", very cheap as they are of 'Basic' quality so that is the product I am planning to use. This achieves a great 'R' rating for $2USD a square foot. (Traditional type EPS sheet insulation is about $5 for the same R value). 4'-6' by 4' panels at 8"-12" thick.

THANK YOU!! ClassicT. Very close. That link is most helpful. There will be no crawlspace, this is slab on grade. The services will be external to the building, like a commercial building, and run through the 142mm (5 1/2") wall to the inside. 'Kopine' is a local brand of T&G particleboard flooring (22mm or 7/8"). The pink line is the top and bottom membrane to keep the EPS dry). The Landscape timber is ground treated and non-structural as the steel SIP wall panels (4.8m x 1m or 16' x 3'6", laid horizontally) are screw fixed to the framing which is held up by the screw piles.

This is my concept:



A HUGE thank you to everyone - I only found this forum yesterday and have already been provided with a solution to my problem - Amazing people.

 

[Grumble]

Fine Homebuilding:

I am replacing the concrete with screw piles. Others are supporting a traditional stick frame (or steel frame) on a ring of C channel steel supported by screw piles.

 

[Paul Sweet]

IBC 406.2.4 requires garage floors to be concrete or similar approved noncombustible and nonabsorbent materials. IRC R309.1 is similar.

IBC Table 1607.1 requires garage floors to be designed for the uniformly distributed live loads of this table or the following concentrated loads: (1) for garages restricted to passenger vehicles accommodating not more than nine passengers, 3,000 pounds acting on an area of 41/2 inches by 41/2 inches ...

If this is an accessory to a residence, the IRC has similar requirements in R309.1 & Table R301.5.

 

[Grumble]

Thank You Paul - Have taken that onboard. I will cross reference with our New Zealand standards.