Meeting fire safety requirements at openings and joints in a PIR roof

A sample PIR panel may have reaction class B-s1,d0. This does not mean non-combustibility or any arbitrary fire resistance. The letter B and the additional designations relate to the scope of this classification, including smoke production and flaming droplets or particles under test conditions.

In the R designations, R relates to loadbearing capacity, E to integrity and I to insulation. The number describes the time in minutes for the relevant criterion and test conditions. It is not a guaranteed time of safe use of the building during any fire.

Identify the exact panel: core, thickness, facings and profile. A document for a similar element does not necessarily cover the selected variant. Also check the support method and the permitted spans. The parameter must be related to the solution that is actually to be built.

If NPD appears in the table, it means no declaration for that property. This entry must not be replaced with a value from an adjacent thickness. A thicker core does not automatically give an arbitrarily higher class. Confirmation of the relevant scope is required.

Compare the roof drawing with the classification conditions. Note the direction of fire action, the structural scheme and the method of making connections. If the design goes beyond the stated scope, a separate solution is required. Citing the class symbol alone is not sufficient.

An opening interrupts the continuity of the panel. Its size and position may change the way loads are transferred and the behaviour of the assembly. The framing, support and correct penetration detail must be planned. A larger opening should not be cut solely for installation convenience.

Record the opening dimensions and the distances from joints and supports. Establish who supplies the penetration element and who seals it. If a solution with specified fire properties is required, each component should comply with its scope.

Rainproof sealing is not automatically fire sealing. Standard flashings may drain water effectively while not providing the required function during a fire. Both tasks must be resolved in one consistent detail.

The panel acts between supports. Their position, width and stiffness affect the entire system. Changing the spacing for easier installation requires verification not only of standard loads. It may also go beyond the conditions of the confirmed fire classification.

Joints are made with specified seals and fasteners. They should not be replaced with random material of similar appearance. The location, continuity and method of seating are important. Details may be covered by the next sheet, so inspection should take place beforehand.

At the roof-to-wall junction, check both elements. The wall panel class does not automatically transfer to the junction or to the roof. This also applies to the skylight perimeter and the termination at an existing building. Each such fragment should have a planned solution.

Attach approved details of atypical locations to the roof plan. Mark openings, supports and any restrictions on changes. The contractor should know which elements result from the classification conditions. This allows problems with access or dimensions to be reported in advance.

Before covering, check the execution of joints and keep documentation. Establish the procedure for a damaged panel or incorrect opening. Not every defect can be repaired with any sealant or an additional piece of sheet metal. The repair must correspond to the function of the given location.

After acceptance, keep a record of the panels used and changes. For later installation of a fan, cable or device, these data must be consulted. A completed roof with confirmed properties does not allow subsequent penetrations to be made without assessing their impact.