Choosing BauderPIR M or MF takes more than a lambda value of 0.022

A set of documents for the specific M or MF thickness and for the connection with the covering will be needed, since the view of the flat field alone does not show all heights. When buying BauderPIR M/MF, it is worth agreeing this part first, before the thickness becomes an assumption for the remaining works.

A PIR core and mineral fleece on both sides make up the construction of BauderPIR M/MF. The family has a format of 1200 × 600 mm, and M and MF differ in edge profile. The Polish M data sheet gives λD 0,026 W/(m·K) for 80 mm up to below 120 mm, so this is not a constant lambda of 0,022. The documentation indicates at least 120 kPa in the compression test and fire reaction E. Bauder PIR boards should here be assessed for the range that is a roof with a PIR board in mineral facing. When checking an order, the term polyurethane boards does not replace the full name BauderPIR M/MF. In BauderPIR M/MF, polyurethane foam of the PIR type forms the core, and the properties of the complete board also include its facings.

Whether the mineral facing is compatible with the roof system is part of selecting BauderPIR M/MF. Compare insulation depths once a suitable board has been identified. At R = 4.00 m²K/W and λ = 0.026 W/(m·K), the required thickness is about 104.0 mm. A comparison board assigned λ = 0.036 would reach that resistance at 144.0 mm. Both thicknesses come from multiplying R by λ. Specify the actual M/MF board from its documentation. The hypothetical conductivity used here is not a product specification.

In the example concerning BauderPIR M/MF, the figures describe only the indicated part of the task. Their use makes sense together with a measurement that covers the thickness of the insulation to be ordered and the condition of the substrate beneath the covering. The property relevant to the comparison is the lambda dependent on the thickness of the M variant. In this arrangement, the correct thickness range in the document for the ordered variant must also be read. Only then does the document set for the specific M or MF thickness and the connection to the covering allow the result to be related to the actual section. The energy calculation should retain the same scope also when comparing with another thickness of BauderPIR M/MF.

The first direction is to retain the designed facing and select the required thickness. The second is to change the entire verified assembly after a renewed comparison. The scope of both actions depends on how important the fleece zone beneath the waterproofing layer is. In the variant with BauderPIR M/MF, the cost of the entire surface should not be increased before the local constraint has been identified. A trap would be to calculate the board with mineral facing using the lambda of the aluminium variant, even if the result for the main field looks favourable. The comparison is only closed when the schedule of parameters covering thickness, facing and edge also includes the differences caused by changing the variant.

The design should clearly specify the plain profile in M or the milled profile in MF. In the description of BauderPIR M/MF, it is worth separating its geometry from the tightness of the other layers. The product surface is formed by a matt mineral fleece, but its presence does not automatically solve the entire detail. What is needed for checking is a description of the fleece on both surfaces and of the correct edge profile. The next stage will be a waterproofing covering compatible with the mineral facing, so the error should not be shifted onto the installer of the next layer. It is worth recording at acceptance how the fleece zone beneath the waterproofing layer was executed and why this method was chosen.

The BauderPIR M/MF quotation should be related to the completed task, not to a single favourable parameter. The calculation should include a schedule of parameters covering thickness, facing and edge. A separate cost may arise from the need for a level substrate beneath the board with undamaged fleece. It is also worth pricing the work at the detail described as the fleece zone beneath the waterproofing layer. The differences should be explained by the specialist approving the compatibility of the insulation with the covering, so that the saving does not result from removing a necessary layer. Insulation compared in this way corresponds to the actual effect that the roof with PIR board in a mineral facing is to deliver.

The selection can be regarded as orderly when the correct lambda and a compatible connection to the covering have been established. For BauderPIR M/MF, this means combining the material data with the solution for the perimeter and the other layers. The document to be retained is the document set for the specific M or MF thickness and the connection to the covering. It should be accompanied by a description of the fleece on both surfaces and of the correct edge profile, so that a later renovation does not begin with guessing the product. There is no need to add a promise of a quick return without a building balance. If the condition that the mineral facing must be compatible with the adopted system changes, it is necessary to return to the comparison instead of copying the previous thickness. Polyurethane insulation has a specific purpose here: to establish the correct lambda and a compatible connection to the covering.