Fixing Insulated Decking To Flat Roofs

New and old ways of fixing flat roof insulation.

Fixing insulated decking to flat roofs.

When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off. The best method of insulating a flat roof is by using a warm deck flat roof construction method. And then install 1 2 minimum recommended is 5 8 or thicker plywood on top of battens. The main advantage of a warm deck construction versus a cold deck construction is that there is no need to include a ventilated cavity in the warm deck construction.

You can see on this photos that the tops of the warm roof insulation fixings have melted the frost. Run vertical 2 3 boards battens over roof sheething 16 o c. Retrofitting flat roof insulation is a difficult task and often a messy one that involves pulling up the waterproof layer that finishes off the deck so as to put flat roof insulation in underneath. To cover the cost of materials tissue trims baton resin and catalyst topcoats and osb boards and labour you will need to spend approximately 1 500.

Decking boards are needed to complete this work and fixing fibreglass on a flat roof covering takes up a lot of time. We have a range of screws nails and fixings available depending on the type of insulation you use we have helical fixings for securing timber counter battens to insulation in pitched roofs flat headed turbo fixings for securing plywood composite insulation boards on flat roofs global fasteners and telescopic tube fasteners to affix a range. Others would treat even steeper pitches as flat roofs. Insulating a flat roof is a task that must be done during construction.

As the warm roof market has progressed standard ways of construction are starting to develop. Fixing down the insulation with long metal screws and or screw nails is becoming a thing of the past. Warm deck construction. How to install insulation in a flat roof with a metal deck.

The insulation boards should be mechanically fixed to the deck. The number of fixings required to fix each board will vary with building location geometry and topographical data and should be assessed in accordance with bs en 1991 1 4. Ponding can lead to premature failures in the waterproofing system and the need to refurbish an area or the entire flat roof before the end of its intended design lifetime. It also provides better thermal performance and makes it easier to eliminate thermal bridging.