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What makes the Passive Slab cheaper than traditional Strip Foundations?
- Internal load bearing walls are built on a thickened slab on EPS300 so there are no external or internal footings.
- Its much quicker to install a Passive Slab, so labour costs are reduced by 20%.
- 60% less concrete is required because there are no footings or screed to pour, so the concrete is poured only once. This lowers the carbon footprint of the house.
- The unique shape of our Passive Slab foundation elements delivers a high yield from a block of EPS, cutting down substantially on waste.
This estimate is indicative only, Viking House/Airpacks will supply a full quotation and once the order is placed a final quotation and order conformation will be supplied.
The width of the ring-beam in the Passive Slab can be varied on site ensuring that the threshold Cold Bridge is eliminated and our competitor’s ongoing problem of where to run the Radon barrier is easily solved. Heavy internal loads can be easily taken onto the insulated foundation by thickening the slab to 200mm and using EPS 300 under the thickened slab. Viking Raft Slab and Viking Waffle Slab are suitable for soft ground conditions, the weight of the house is transferred throughout the slab, so we have solutions for most situations.
The floor below was designed to have a U-value of 0.25W/m.K but when the heat-loss due to cold bridging was added the U-value jumped to 0.47W/m.K. When we calculated the heat-loss at the front and rear door threshold and where the chimneys sit directly on the ground the actual U-value jumped to over 0.60W/m.K.
Click image for larger view
It's important to start with well insulated Passive Slab foundations when building a Passive house. If a Passive house was built using standard Irish foundations, heat loss and condensation would occur at the wall/floor junction leading to fungus and mould growth. We don’t use Polyurethane (Kingspan, Quinntherm) in wet areas under concrete floors in our insulated foundations because the Lambda value of PUR deteriorates as it gets wet. Layers of plastic below and above foundation insulation traps condensation and drives moisture into the insulation.
Click image for larger view
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Viking G element (above) with Quinnlite (AAC) internal leaf and concrete block external leaf, 200mm cavity wall (below) filled with Platinum bead on a sawtooth beam, Viking Double L (above) with Timber Frame wall and concrete block external leaf on a separate footing. The backwards L (below) requires less support and offers improved U-values. You can see how easy it is to run the Radon Barrier with our system.
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Click on the thumnails below to download pdf
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Internal load-bearing wall on EPS 300 |
Externally Insulated Poroton Block detail |
Thickened load bearing slab on EPS 300 |
Insulated Concrete Forms detail |
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Timber Frame wall with external block |
Timber Frame with Acquapanel |
Viking Triple L |
Threshold |
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Assembly |
Cutting Patterns |
OLS foundation details
Threshold Detail
Ring Beam Section A-A
Step detail Sction D-D
James Byrne's Lime/Hemp Passive house in Longford
