01695 280510

01695 280510
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SIP Panels

Structural Insulated Panels that can be the solutions to your building requirements

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Captrad are able to supply a wide range of SIP panels and can offer a cut out service


Structural Insulated Panels (SIPSIPS Panelss)

SIPs are a sandwich of Oriented Strand Board (OSB) with an insulating polyurethane foam filling.
The OSB and the foam are rigidly bonded together resulting in a strong, stiff, highly insulated panel suitable for structural use in buildings.


Our standard range of panels has three thicknesses, 100mm, 125mm and 150mm, and panels areup to 1.2m wide and 6.250m long. The face boards are  normally 12mm thick OSB3 (for structuraluse in damp conditions). Other thicknesses and constructions are available on request, including 15mm face boards, particle board faces and up to 175, 200, 225 & 250mm thickness panels.


Joints are made using expanding polyurethane glue and nails or screws. This ensures strong airtight joints.

Panels are joined edge to edge by gluing and nailing fillets into their rebated edges. These may be either thinner SIP fillets or timber. Timber fillets are used when additional strength is needed.

Rebated wall panel bases slot over pre-fixed timber sole plates and are secured with glue and nails.

Sloping roof panels rest on triangular timber eaves fillets and are secured with glue and screws.

Edge openings, such as window reveals, are lined with inset timber to allow easy fixing of frames.

Floors may be sandwiched between upper and lower walls or may be attached to panel inner faces
with joist hangers. Floors are usually made from engineered joists but SIPs may be used in some
cases, particularly where the underside is open, such as over passageways. Floors may also be
supplied in cassette form.



SIPs are usually used in roofs and external walls of buildings but may also be used in floors and internal walls. Their high axial load capacity and good bending strength, together with their excellent insulation and air tightness, produces sturdy warm structures. The current BBA certificate covers two storeys plus roof storey. However, the system is not necessarily limited in this respect and four storeys or more are possible when independently engineered.

Structural Design

Like timber, SIPs are stronger and stiffer along the grain and they undergo creep and shear deflections. In axial compression it is safe to use the values given for the panel properties below. Shear deflections are greater than in timber because the foam core has a lower shear modulus and in most cases the shear deflections dominate. Creep is also more important than with most other structural materials.

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