THERMOISOL is a mineral plaster with high thermal insulating power from T1 category, fibre reinforced, very transpiring and vapor repellent to the outside. It is composed of virgin polystyrene microspheres, flame retardant with high density, and specific admixtures. It is a product in powder and it must be mixed with water for a manually or mechanical application, conforming with European law 89/106/CEE in reference with UEI EN 998-1; for an internal or external application, it is compatible with finishing coats based on lime plastic ,silicates and siloxane.
Before the product application, the masonry must be coarse, clean, hard and absorbent, free from crumbling parts, oils, greases and everything that prevent a good adhesion. Soak abundantly the substrate and apply an uniform render based on cement and sand (one part cement and two parts washed sand) or a premixed cementitious gripping, and let cure for 2/3 days. On difficult substrates (like old masonry), it is recommended to apply before a fiberglass mesh for plaster reinforcement.
Mix about 8/10 lt of water for every 50 lt sack (about 13 lt). It is important to mix all the sack contents and not just a part, because the components try to separate during the storing or the handling, because they have different specific weights.
The air temperature and the substrate temperature during the application must be between +5°C and + 30°C. Apply the product manually with a trowel or mechanically. If the product is mixed with a machine, the best mixer is the conventional one, the freefall mixer. Level the product with a slat or a wood or aluminum straightedge. For large thicknesses apply the product in several layers, when the previous layer starts the grip (about 3/4 hours). During hot period is recommended to soak the applied plaster for 24/48 hours at least, at close intervals to avoid fast evaporation with consequent possible formation of superficial micro-cracks. Before the application of any finishing product it must pass 15/20 days at least (approximately it must pass 5/6 days for any centimeter of thickness). The surfaces treated with THERMOISOL should not be subject to driving water jets and they are not suitable for tiles covering or similar. Before any kind of finishing, we suggest to apply a coat of RASOCEM KR white or grey, dipping an adequate fiberglass mesh. The mortar mixed with water must be employed by two hours.
To guarantee a better resistance and to apply low thickness finishing plasters, it is necessary to implement a smoothing in two layers with grey or white RASOCEM KR, with the annex layer of primed fiberglass mesh. Later it will be possible the application of a lime-based finishing (like Intocolor KR KRF) plastic coverings (Taormina Plast) silicates coatings (Taormina Sil) or siloxane coatings (Taormina Silox).