Steve_S
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# Posted: 22 Dec 2025 09:16am - Edited by: Steve_S
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Near Algonquin Park here... I used a Frost Protected Slab Foundation (FPSF) incorporating R20 high-density foam under & surrounding the slab, with 7/8" Radiant Heat plumbing within, and it's the ultimate for comfort, when it's 24C inside, everything is 24C, no COLD floor, or bed to crawl into, warm walls and more... Great for a creeky ol geezer ! The thermal mass also helps keep the house cool in summer along with the passive building methods used in its construction.
* MAX Height allowable on an Ontario road is 13.6' from the road surface to the absolute top. But if not going on the road (moving it on the property) it's whatever, but trickier too... lumpy bumpy ground +++
Lessons Learned Dept: - I built standard 8' high walls and I really should have built 12' high wals (storey & half) with my loft side floor at 8' as usual, providing a "half wall/knee wall" for the loft giving better clearance.. I do have a 10:12 Pitch roof so it's pretty steep, and it woudl have worked a treat for clearance etc. *NB: Note that a 1/2 Story is not calculated as "Living Space" for Tax Purposes which also helps keep insurance down a bit (every bit counts these days). Also makes for a nicer Cathedral Ceiling in the open area. DO consider a skylight or two.
- I designed & built everything using a 10x12 block method as I went 20x24 footprint. I prebuilt all the wall modules on the slab and stacked them up, when it came to assembly, 3 friends came up and we had all walls up within an hour and screwed together with structural screws and anchored to the secured baseplate on the concrete (gasketted & sealed).
- Hindsight, should have likely gone 24'x30' but that would have put me in a different class. Regional classifications at the time.
* I worked for Guildcrest Homes (Modular home builder) in Morewood, Ontario, for a couple of years after I burned out of the High Tech IT sector and learned several great tricks to my benefit, and i learned how hard it is to build something that will be moved, it's not that simple OR cheap really. But again, those modules were shipped by transport distances so that's a big part... bad thing to have fall apart on the roads eh ! LOL.
Personally, I would design & build accounting for future expansion by creating wall sections that can be easily opened up when additions are made, allowing for seamless integration.
Hope some of this is useful to you. Steve
PS: My home is Hyper Insulated. 9" thick walls with UHD closed cell Foam Insulation sheets & 12.6" thick roof filled with Solid PolyIso Sheet insulation. Both are Thermally Broken. Rainscreen Siding (live edge Cedar) with 2" free flow airspace to Cool Roof system that also has 2" airspace between shell & root that allows air to be pulled up from the walls using convection & vented out the roof via the Ridge Vent. This prevents heat loss/gain within the structure. All wiring & plumbing are internal, meaning that none of it travels through the exterior walls, it's all within the interior walls or coming down from above, so I have minimal air leakages, improving efficiency. Windows & Doors are installed into Insulated "Bailey Boxes" which are installed into the walls first, keeping everything thermally broken to prevent losses/gains.
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