CPS or SIP?

Choose around the insulation you want, the access your site allows and the full cost of erection.

Your insulation preference.
Your site requirements.

A key reason to choose CPS is its blown glass-wool insulation: it avoids the rigid foam insulation used in SIP wall construction. CPS also reduces the work remaining on site through factory preparation.

The trade-off is access and lifting. CPS requires a crane, which can add plant costs. Our lighter SIP panels can be a practical alternative for restricted or remote sites.

Closed Panel System

CPS

Sigma II wall cutaway from the HebHomes website — Sigma II wall cutaway showing the insulated timber frame and wall layers. Masonry cladding is illustrated; finishes follow the project specification.

Structural Insulated Panels

SIP

Hemsec isometric illustration showing SIP panels with OSB faces, insulation cores and a timber connection component — Hemsec’s SIP illustration shows the rigid PUR insulation core between OSB faces. Panel sizes and additional wall layers follow the agreed HebHomes specification. Image: Hemsec.

What matters for your build

Insulation choice

CPSBlown glass-wool insulation within the timber frame. The option for clients wanting to avoid PIR/PUR rigid foam in this wall system.

SIPRigid polyurethane (PUR) foam forms the panel core. Our wall build-up also includes additional insulated lining.

Wall performance

CPSTypical published wall U-value: around 0.13–0.15 W/m²K, without additional insulated plasterboard.

SIPOur published example wall build-up achieves around 0.16 W/m²K with the additional insulated lining.

Crane & access

CPSRequires a crane and suitable delivery access, plus space and ground conditions for its setup and operation.

SIPLighter panels can suit more restricted or remote sites. Delivery access and the lifting method still need checking.

Plant costs

CPSThe crane and any access or ground preparation can increase plant and site costs. Include these when comparing the options.

SIPLower lifting demands may reduce plant costs on some sites. Compare the complete erection arrangements, not the panel price alone.

Work after erection

CPSFactory insulation, membranes and service-zone preparation reduce the work remaining on site. Internal finishes and building services still follow.

SIPThe specified vapour-control details, service battens and insulated lining involve additional site work after the panels are erected.

Compare the complete wall

Lower U-values mean less heat passes through the wall. The figures above describe the example wall build-ups currently published by HebHomes, not a bare SIP panel or a guarantee for every design. Your agreed specification confirms the project values.