BauderPIR FA for continuous roof insulation with high thermal resistance

Before the thickness of BauderPIR FA starts setting the conditions for further works, this particular element of the order should first be clarified.

The core made of PIR foam together with the aluminium facing on both sides forms the structure of BauderPIR FA. The board has external dimensions of 2400 × 1200 mm and installation dimensions of 2385 × 1185 mm, and the milling provides a 15 mm wide overlap. The declaration states λD 0,022 W/(m·K), a compression level of CS(10/Y)120 and fire reaction E. Despite its large format, the board does not act as a self-supporting structural element. The application range to be considered here for Bauder PIR boards is the insulation of a large, regular roof field. When checking the order, it is not enough to use the term polyurethane boards — the full name BauderPIR FA must be used. In BauderPIR FA the core is PIR-type polyurethane foam, while the properties of the complete board also depend on its facings.

Before ordering BauderPIR FA, check the available thicknesses and the effective area each board covers once the rebated edges overlap. For the insulation layer alone, multiplying an assumed R of 4.00 m²K/W by λ = 0.022 W/(m·K) gives about 88.0 mm. A comparison material assigned λ = 0.036 would need 144.0 mm. That difference concerns depth in section, while the rebate affects coverage across the roof. The comparison conductivity is an assumption, not a value for an entire group of other products.

In the example concerning BauderPIR FA, the figures describe only the specified part of the task. Their use makes sense together with a measurement that includes the actual covering area and the widths of the strips at the perimeter. The property relevant for comparison is the covering dimension 2385 × 1185 mm. In this layout, the external dimension must still be compared with the installation dimension before the quantity take-off. Only then does a row plan based on the effective board dimension allow the result to be related to the actual section. The energy calculation should retain the same scope also when comparing with another BauderPIR FA thickness.

The first direction is the layout of full boards in regular rows. The second is adapting the layout to zones with numerous cuts. The scope of both actions depends on how important the milled edge of the large-format board is. In the BauderPIR FA variant, the cost of the entire area should not be increased before the local limitation has been identified. A trap would be to order material according to the 2400 × 1200 mm outline without taking the milling into account, even if the result for the main field looks favourable. The comparison is only closed when the covering area schedule and the pallet layout plan also include the differences caused by changing the variant.

The design should clearly specify the milling that creates the 15 mm wide rebate. In the description of BauderPIR FA, it is worth separating its geometry from the tightness of the other layers. The product surface is formed by the aluminium facing on both sides of BauderPIR FA, but its presence does not automatically solve the entire detail. What is needed for checking is a record of the FA designation and confirmation of the 15 mm wide milling. The next stage will be the covering selected for the BauderPIR FA layout, so the error should not be shifted onto the installer of the next layer. It is worth noting at acceptance how the milled edge of the large-format board was executed and why this method was chosen.

The price of BauderPIR FA should be related to the completed task, not to a single favourable parameter. The calculation should include the covering area schedule and the pallet layout plan. A separate cost may arise from the fact that the support intended for large roof boards is needed. It is also worth pricing the work at the detail described as the milled edge of the large-format board. The differences should be explained by the coordinator of the quantity take-off and roof area organisation, so that the saving does not result from removing a necessary layer. Polyurethane insulation compared in this way corresponds to the actual effect that the insulation of a large, regular roof area is to achieve.

The selection can be regarded as orderly when the roof slope has been covered while correctly accounting for rebates and cut-offs. For BauderPIR FA, this means combining the material data with the solution for the perimeter and the other layers. The document to keep is the row plan based on the effective board dimension. It should be accompanied by a record of the FA designation and confirmation of the 15 mm wide milling, so that a later renovation does not begin with guessing the product. There is no need to add a promise of a quick payback without a building balance. If the loss of covering area caused by the rebate changes, one must return to the comparison instead of copying the previous thickness. Polyurethane insulation has a specific purpose here: to cover the roof slope while correctly accounting for rebates and cut-offs.