Fixing Insulated Decking To Flat Roofs

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.

Fixing insulated decking to flat roofs.

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. 1 get insulated panels with osb board attached to iso insulation you will then screw this over current roof deck. 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. How to install insulation in a flat roof with a metal deck.

New and old ways of fixing flat roof insulation. Warm deck construction. The insulation boards should be mechanically fixed to the deck. 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.

A flat roof should always allow for water channelling and drainage to prevent issues such as ponding. You can see on this photos that the tops of the warm roof insulation fixings have melted the frost. 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. 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.

Others would treat even steeper pitches as flat roofs. And then install 1 2 minimum recommended is 5 8 or thicker plywood on top of battens. Run vertical 2 3 boards battens over roof sheething 16 o c. Fixing down the insulation with long metal screws and or screw nails is becoming a thing of the past.

As the warm roof market has progressed standard ways of construction are starting to develop. When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off. The definition of a flat roof according to bs 6229 is having a pitch less than 10 o to the horizontal however some in the industry would consider up to 15 o as their definition of a flat roof. It also provides better thermal performance and makes it easier to eliminate thermal bridging.