Approximately 20% of the total heat loss from a family house can come from basement and/or cellar walls. In order to reduce energy consumption, achieve a pleasant indoor climate and prevent surface condensation, rooms in direct contact with the soil should have enhanced thermal insulation. Thermal insulation of unheated areas or unused basement/cellars can also be useful to prevent the development of heat bridges at footings or to avoid undesirable condensation.
PERIMATE™ DI-AP closed-cell polystyrene foam is highly suitable for underground thermal insulation, and has a number of benefits:
- closed-cell structure
- excellent thermal insulation capability
- high compressive strength.
Permanent moisture or pressure caused by groundwater or soil should not decrease the efficiency of thermal insulation products integrated in building structures that are in direct contact with the soil.
With their closed-cell structure resulting from the manufacturing technology, PERIMATE™ extruded polystyrene boards maintain their high thermal insulation values even in the permanent presence of moisture (soil vapours/moisture, groundwater or stratum water) and under intensive mechanical load. Professionally installed thermal insulation provides long-term and reliable protection.
The physics of buildings means that installing thermal insulation in the cold external surface prevents moisture condensation on the warm indoor surfaces and within the building structure.
Efficient external cellar wall insulation should remain unaffected by long-term exposure to moisture, groundwater and soil pressure.
The closed-cell structure, excellent thermal insulation properties, water resistant and high compressive strength of PERIMATE™ allows the product to be installed as the outermost layer of wall structure, and even in direct contact with the soil. Offering numerous advantages, external thermal insulation will help prevent a building’s heat loss capacity.
THERMAL INSULATION AND PROTECTION OF THE INSULATION
When laid on to the waterproofing surface, PERIMATE™ provides the structure (and the waterproofing surface) with thermal and mechanical protection.
PERIMATE™ can also be applied in the presence of groundwater (assuming there is waterproofing membrane), in addition to offering protection from soil moisture.
THERMAL INSULATION FOR GROUND MOISTURE
PERIMATE™ insulation boards can be simply bonded with polyurethane solvent-free adhesive foam to the external face of the waterproofing membrane or the waterproof reinforced concrete cellar wall. Adhesive should be bead-applied (with minimum three strips per board) to wall surfaces. The insulation boards should be installed with tight joints and in brick pattern, either horizontal or vertical position on the cellar wall. PERIMATE™ boards must stand on a firm base area at the foot (for example foundation step), and have a support base to avoid sliding when compacting the backfill later.
INSULATION IN GROUNDWATER
PERIMATE™ boards can be used exposed to permanent groundwater. The entire surface of the insulation boards should be pasted to the waterproofing membrane or watertight reinforced concrete wall using solvent-free cold bitumen adhesive in order to prevent water standing between the insulation layer and the membrane or concrete wall.
Extruded polystyrene boards are nonbiodegradable, so their use does not impose an environmental risk to soil integrity, nor the biological composition of the soil and fresh water.