Suitable for installation in insulated loft / roof voids to protect downlights from being covered by insulation material. Suitable for installation between all common joist spacings. Designed to meet compliance of Building Regs Part L, NHBC & other interested parties / insurers where the loft insulation is to be laid unbroken over the whole ceiling area to avoid "thermal bridging" - i.e. loss of heat through spaces normally required to be cut in the insulation for the fitment of luminaires. Supplied flat packed. Easily assembled without tools. Withstands a load of up to 20kgs (depending on ceiling construction).