RENDER COMPRISING HONEYCOMB AND CEMENTITIOUS OR CLAY OR GEOPOLYMER MATERIAL
A render layer for a building comprises a honeycomb core of nonwoven polypropylene web, and a cementitious material fully filling the cells of the core, wherein (i) the nonwoven web has a porosity of from 5 microns to 600 microns, (ii) the core has a cell size of from 5 mm to 200 mm, (iii) the expansion and contraction across the plane of the core is greater than the expansion and contraction of the cementitious material filling the cells of the core, and (iv) the cementitious material is partly impregnated into the cell walls of the core.
1 . A render layer for a building comprising
(i) a honeycomb core of nonwoven polypropylene web, and
(ii) a cementitious or clay or geopolymer material fully filling the cells of the core,
wherein
(a) the nonwoven web has a porosity of from 5 microns to 600 microns,
(b) the core has a cell size of from 5 mm to 200 mm, and
(c) the expansion and contraction across the plane of the core is greater than the expansion and contraction of the cementitious or clay or geopolymer material filling the cells of the core
2 . The render layer of claim 1 wherein the honeycomb core has a cell size of from 5 mm to 50 mm.
3 . The render layer of claim 1 wherein the cementitious material comprises plaster, mortar, concrete, mineral or organic binder.
4 . The render layer of claim 1 wherein the nonwoven web has a porosity of from 80 microns to 120 microns.
5 . The render layer of claim 1 wherein the expansion and contraction across the plane of the core is at least 10% greater than the expansion and contraction of the cementitious material filling the cells of the core.
6 . The render layer of claim 1 wherein the cementitious or clay or geopolymer material is partly impregnated into the cell walls of the core.
7 . The render layer of claim 2 wherein the honeycomb core has a cell size of from 11 mm to 22 mm.
8 . A composite cladding structure for a building wall, comprising in order
(i) an insulation layer,
(ii) the render layer of claim 1 , and
(iii) at least one decorative layer,
wherein the insulation layer is affixed to the building wall mechanically and/or with adhesive.