GUTEX Multiplex-Top

from $1.01 /sq ft
/sq ft
from $1.01 /sq ft

Product Specifications


Foam free rigid insulation board and roof underlayment in one, made from moisture resistant wood fibers. High quality single-ply construction.


Multiplex Top 22 7/8"
Multiplex Top 28 1 1/8"
Multiplex Top 35 1 3/8"


  • Hydrophobic treatment (1.0% paraffin) allows board to act as a  temporary roof and weather and wind protection
  • Tongue and groove edges mean that boards’ edges do not have to line up with rafters in the roof
  • Raw material for all GUTEX insulation boards comes solely from wood that is harvested and grown using sustained forestry management practices
  • Boards are made using the dry process meaning that the boards contain 94.5% wood, and maximizes the use of this sustainable, recyclable natural resource


  • U-value: 0.044 W/mK
  • Perm rating: 44/inch (Sd 0.30m for 100 mm board)
  • Acts as subroof for pitches >15′ (3:12 pitch)