Quick Answer
To build a thermal mass wall, start by excavating and compacting the earth for the berm, then pour a concrete foundation and attach thermal mass elements such as concrete blocks or bricks. Finish with insulation and a weatherproof exterior. Regular maintenance ensures optimal performance.
Excavation and Foundation
Excavation for a thermal mass wall typically involves digging a trench 6-8 inches deep and 12-18 inches wide, depending on the desired berm height. This space will be used for the foundation, which is usually a 4-inch thick slab of concrete. The foundation should be level and compacted to prevent shifting and ensure stability.
Building the Thermal Mass Wall
To create the thermal mass wall, start by stacking the thermal mass elements, such as concrete blocks or bricks, to the desired height. Leave a 1/4 inch gap between each course to allow for expansion and contraction. This will also help with drainage and prevent water accumulation. Use a level to ensure the wall remains straight and plumb.
Finishing and Insulation
Once the thermal mass wall is complete, cover it with insulation to reduce heat transfer and prevent heat loss. A 3-inch thick layer of foam board insulation or spray foam is a good starting point. Finally, apply a weatherproof exterior finish, such as stucco or render, to protect the wall from the elements. Regular maintenance is essential to ensure the thermal mass wall continues to function effectively. This includes inspecting for cracks and damage, re-sealing gaps, and re-applying the weatherproof finish as needed.
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