Controlled permeability formwork (CPF) liner.
Zemdrain® controlled permeability formliners (CPF) considerably improve the quality of the concrete surfaces of vertical and inclined walls. They are fixed to formwork before erection and once erected, concrete is placed and compacted in accordance with normal practice.
The liners retain the concrete fines whilst allowing the controlled drainage of excess air and water that is normally trapped at the concrete/ formwork interface. Additionally, water retained within the formwork side of the form liner is given back to the concrete during the curing phase.
Use of Zemdrain® optimizes the surface water/ cement ratio, minimizes blowholes and improves early age curing to give a high quality durable concrete surface with optimum resistance to all forms of environmental attack.
Flat, convex, timber, steel and plastic.
E20/665 Controlled permeability form lining finish
Zemdrain® cover tape
Zemdrain® double-sided adhesive tape
Zemdrain® foamed plastic joint tape
Standard product features
Can be secured to formwork using a fixing tool, timber board, staples or tensioned.