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Thermal mass is an interesting topic so in this video we take a look at the placement of insulation in a concrete slab, with a slant towards doing so for a garden room in the UK.
Some extra notes that would have muddied the video had I included them:
1) Adding any kind of underlay or flooring (laminate for example) over a concrete floor will reduce the thermal mass properties of the concrete underneath. The biggest effect will come from an uncovered slab (for better or worse depending on your climate and use of the building).
2) The diagrams are not to scale but are reasonably accurate. The first option should have insulation up the sides to insulate it from the ground to the sides. Also whether you have a DPM/vapour barrier above the concrete will depend on whether the concrete has fully finished curing or whether you know if there is a DPM under the concrete (an old shed concrete slab for instance). If in doubt add another on top, it won't hurt.
3) All of this is just my layman's opinion. I like science, geography and construction and put them together with a bit of research. You can't go too far wrong with any of the options though 🙂
0:00 Intro
0:14 insulation choices
0:46 The 3 options for placement of insulation
1:13 What is thermal mass?
2:12 What is the roof overhang for?
2:31 Choosing the best option
3:30 Other pros & cons
4:29 Outro
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