Edilite Poliiso® Vv Thermal Insulation
POLIISO® VV THERMAL INSULATION
POLIISO® VV THERMAL INSULATION
POLIISO® VV is a yellow thermal insulation panel made of rigid, closed-cell PIR foam, expanded between two saturated glass fiber supports.
INFORMATION
BRAND
Edilite
THICKNESS
20-140 mm
LENGTH
1200 mm
WIDTH
600 mm
DOWNLOADS
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VALUES
- Panels Declares Λd Values : 0,022 W/mK
- Compressive Strength Values : ≥ 150 kPa
THICKNESS TOLERANCE CLASS (T2)
- Thickness < 50 mm : -2 /+2
- Thickness from 50 mm to 70 mm : -3 /+3
- Thickness > 70 mm : -3 /+5
MAXIMUM OPERATING TEMPERATURES
up to 110 °C
REACTION TO FIRE
E
APPLICATIONS WITH POLIISO® VV
THERMAL INSULATION FOR HOT FLAT ROOFS UNDER BITUMINOUS MEMBRANE
The "hot roof" type is made with bituminous or synthetic membranes, but the thermal insulation is always laid under the membrane. The advantage of this solution lies in the fact that is well known and has been widely used for a long time thus reducing any possible errors. The insulation is always protected by the waterproofing and its characteristics and performance are preserved at length without any washout effect.
The type of insulation required in this type of application must have the following characteristics:
- Excellent insulation properties
- Good compressive strength
- Resistance to heat
- Resistance to solvents contained in bitumen
Please bear in mind that extruded polystyrene and expanded Styrofoam CANNOT RESIST to temperatures over 80°C that can be reached not only during laying, but also in operating conditions. Special attention is to be paid when laying these products in contact with artificial and bituminous membranes with a high content of plasticizers and solvents. Fiber products DO NOT HAVE adequate resistance to humidity to ensure constant performance over time. Fiber products DO NOT HAVE adequate compressive strength resistance to humidity to ensure constant thickness and resistance to treading over time. Expended polyurethane panels are the optimal solution for this type of application. POLIISO® SB is especially recommended for flat roofs under bituminous membrane and ensures best possible adherence to the waterproofing layer.
LAYING
The extrados of the slanting concrete slab (at least 1% gradient recommended) is to be cleaned by removing any cement clots that may alter the levelness of the laying surface and any differences in height are to be leveled. A hand of primer is to be applied as well in case of surface scrubbing. Once the slab is ready, a vapor barrier is laid to avoid that it can penetrate from the inside and to prevent the risk of condensate inside the insulating material. In applications with non-ballasted coating, the barrier must be glued to the covering. The vapor barrier must be resistant to the penetration of water vapor greater thanor at least equal to that of the waterproofing layer.
The POLIISO® SB expanded polyurethane boards are then laid after the laying of the hot bitumen only on the surface of the single panel being laid (to avoid the cooling of the bitumen. The recommended quantity of bitumen is 1.5-2 kg/m2). A separating layer and waterproofing bituminous membrane are applied on the polyurethane panels. The membrane is to be heated on the bitumen-coated glass fiber coating the panel, which quickly melts making the laying of the upper membrane much faster. A slated membrane with polyester fiber reinforcement is applied to finish. The slated membrane protects the coating, improves weather resistance and reduces the need for maintenance to a minimum. POLIISO® SB is easy to lay because it is lightweight and easy to handle: we recommend fitting the panels with staggered joints.
ADVANTAGES
- Fast laying.
- Perfect adherence to membranes and coatings.
- Great stability and duration over time.
- Compressive strength and high thermal insulation.
The coating at sight is applied directly on the insulating layer either by total adherence, controlled semi-adherence or mechanical fastening and finished with self-protected membranes or reflecting protection applied subsequently. In some cases, thermal variations may cause lesions to the coating and affect bonding with the insulation and underlying layers. Adherence between the coating, vapor barrier and insulation panel must always be greater than that between the panel and coating.
WARNINGS
If operating conditions are especially severe, diffusion layers are to be laid. They consist in thin perforated membranes that direct to the diffusers the water vapor from the inside or located below the coating during laying. It is fastened by points on top of and/or below the POLIISO® SB boards compensating the structural tensions or dilations due to thermal variations in the membranes.The installation of single or double diffusers to dispel the vapor that condensates on one or both sides of the insulation boards.
THERMAL INSULATION FOR HOT FLAT ROOFS UNDER SYNTHETIC MEMBRANE
The "hot roof" type is made with bituminous or synthetic membranes, but the thermal insulation is always laid under the membrane. The advantage of this solution lies in the fact that is well known and has been widely used for a long time thus reducing any possible errors. The insulation is always protected by the waterproofing and its characteristics and performance are preserved at length without any washout effect.
The type of insulation required in this type of application must have the following characteristics:
- Excellent insulation properties
- Good compressive strength
- Resistance to heat
- Resistance to solvents contained in bitumen
The most suitable product for this type of application is undoubtedly rigid expanded polyurethane. Please bear in mind that extruded polystyrene and expanded Styrofoam CANNOT RESIST to temperatures over 80°C that can be reached not only during laying, but also in operating conditions. Special attention is to be paid when laying these products in contact with artificial and bituminous membranes with a high content of plasticizers and solvents. Fiber products DO NOT HAVE adequate resistance to humidity to ensure constant performance over time. Fiber products DO NOT HAVE adequate compressive strength resistance to humidity to ensure constant thickness and resistance to treading over time. Expended polyurethane panels are the optimal solution for this type of application. Synthetic coatings are blends of resins mixed with plasticizers, stabilizers and pigments produced by extrusion, calendering and spreading. The structure can either be homogeneous, stabilized and reinforced or even fiber-reinforced.
The use of a synthetic membrane at sight requires the use of anti-UVA additives. The polyurethane panels can be laid dry or with compatible additives; the synthetic membrane must always be left free from the insulation. The joints between the coating’s components are achieved by hot welding or with solvents. The various layers can be laid dry in case of ballasted coatings.When dry laying is not recommended, the coating can be fastened mechanically or glued with adhesives. Hot bitumen is one of the most widely used. A quantity of about 1.5-2 kg/m2 is spread evenly on the surface to be bonded. The separation layers (non-woven fabric of about 500g/m2) inside the package protect the vapor barrier, normally composed of a polyethylene sheet and synthetic coating, against the roughness of the laying surface and abrasions caused by the ballast layer. POLIISO® VV expanded polyurethane panels with glass fiber supports are the recommended type of insulation for this type of application, because they ensure good compressive strength values, excellent thermal insulation values and resistance to the high temperatures that develop under the membrane both during laying and service life.
METAL DECK
It is a system used to build non-treadable metal flat roofs for industrial buildings. These roofs have a gradient ranging between 1% and 5%. It is type of hot roof, since the thermal insulation is to be laid under the waterproof membrane.
LAYING : The vapor barrier is applied on the metal plates forming the roof. The POLIISO® ED expanded polyurethane insulation panels are applied on this surface by trying to perfectly fit each panel together to cover the entire roof. The panels are to be fastened mechanically using screws at about 10 cm away from the perimeter of the insulation panel: do not insert them either along the edges or at the center of the panels.
The screws must be long enough to cross the thermal insulation and the metal plate. The waterproofing membrane is then applied on the insulation layer and it too is to be fastened mechanically along the perimeter. In order to overlap two strips of adjacent membranes, use adhesive or hot air, depending on the type of bituminous membrane and on the manufacturer's instructions. The roof is then finished with a heavy protective layer.
SLOPED ROOFS WITH VENTILATED GAP BELOW MEMBRANE
It is a type of sloped roof in which the tiles are applied on wood strips to create an air cavity of about 2 - 4 cm in thickness between the insulation layer and finishing layer. The ventilated air chamber between the tiles and insulation prevents condensate from forming under the tiles and that the roof heats up too much due to exposure to sun radiation.
LAYING : A vapor barrier is applied on the roof's cement slab, which is to be perfectly smooth. The POLIISO® SB expanded polyurethane panels are then laid by arranging them diagonally compared to the slope's direction. The panels are to be laid from the eaves to the ridge. The panels are to be laid over a layer of about 1.5-2 kg/m² of bitumen spread evenly over the surface. Mechanical fastening is also possible.
The waterproofing membrane to ensure water tightness is flame-applied on top of the insulation layer, thus bonding to the bitumen on the part facing the panel's extrados. The wood strips are then fastened in the direction of the slope's gradient by means of screw anchors long enough to cross the cement slab by about 3-4 cm. The horizontal strips are fastened on the first series of vertical strips using corrosion-resistant metal nails. The distance between the strips is determined by the pitch of the tile selected.
HOT GREEN ROOF (TRADITIONAL GARDEN ROOF)
This type of hot or traditional flat roof is obtained by applying the waterproofing on the insulating layer. In order to avoid hygrothermal problems, besides using a vapor barrier, a good drainage system is to be used to dispel water vapor.This type of roofing is used when creating roof gardens with any type of plant either for esthetic or environmental purposes.Garden roofs can pose hygrometric and static problems if special attention is not paid during the design phase. Good thermal insulation is essential.
LAYING : A coating of lightweight mortar with a minimum gradient of 1% is applied on the roof's concrete slab. A vapor barrier is laid on this coating following by the POLIISO® SB expanded polyurethane insulation panels, which are applied trying to cover the entire roof surface. The insulation panels must be fastened to the hardcore with hot bitumen.
A separating layer and waterproofing bituminous membrane are applied on the polyurethane panels. A root barrier membrane is applied to finish. If the drainage layer has particles with a diameter of less than 10 mm, a filter layer is to be applied to protect the waterproofing against abrasion by the drainage layer and soil. The roof is completed by applying an adequate layer of soil or humus on the drainage layer depending on the type of vegetation to be planted.