IDELCO Smartbuild System: specifying a prefabricated SIP wall and its insulation

Break down the section into the OSB-faced panel, connections to adjacent elements and layers added on site. At each joint, mark the load-transfer component and the seal line. This allows connectors, seals and finishes to be allocated to the correct items in the order.

Thermal conductivity λ in W/(m·K) describes the core material. Thermal transmittance U in W/(m²·K) relates to a specified build-up and thickness. If a schedule gives a number without units, consult the panel sheet to establish which quantity it represents.

Record the conditions attached to the U-value, including facings and any joints included in the calculation. In the whole-elevation assessment, allow for opening perimeters, corners and the foundation junction. Two elevations with the same panel area can have different lengths of these junctions.

Give each opening a grid reference, sill or invert level, width and height. Coordinate service sizes and sealing space with the installers. Before fabrication release, compare the penetration schedule with the panel structural drawing.

If an opening moves after delivery, identify the element and give the designer the exact dimensions of the proposed change. Cutting the OSB facing may alter the load path. File the agreed method and any reinforcement detail against the individual panel reference.

Before erecting the corner panels, measure the grid position and bearing level on the foundation. Mark the survey points on the drawing so a later offset can be traced. Take permissible tolerances from the erection documents for the system.

Inspect the corner from inside and outside. Photograph the mechanical connection, seal continuity and drainage detail at the bottom edge. Label the record with both panel numbers before subsequent layers cover the junction.

Checking structural capacity requires data for the specific panel, support positions, loads and connections. At an opening, also establish how loads pass down its sides. Data for thin-faced insulation boards are insufficient to specify a prefabricated structural element.

Apply fire requirements to the assembly in its intended configuration. Check the type and number of lining layers, joint closures and service penetrations covered by the classification document. Record the details actually installed in the as-built documentation.

Ask bidders to itemise shop drawings, prefabricated elements, transport, unloading and erection. List connectors and sealing materials separately. Use the drawing to identify where each contractor’s work ends at the foundation and roof.

At unloading, check references and facing condition. Coordinate the packing sequence with the erection crew, particularly if there is room for only one bundle on site. Identify who protects exposed edges during breaks in the work.

Consider two successive grid lines with panels of the same width, only one of which has a ventilation opening. Label each with its grid line, panel number and external face. Check the opening location at the first grid line before the crew fixes the second wall. This is easier than swapping connected panels later.