The membrane is then attached to the insulation. Installing Deck on a Flat Roof Tips.
Flat Roof Warm Deck Construction Youtube Warm Roof Roof Construction Deck Construction
To put together a warm deck roof its important that the insulation be positioned above the structural deck the layers that make up the ceiling.
How to do a warm deck flat roof. The battening and tiling is then fixed down over. Apr 06 2020 Warm deck roof construction advice. Extension Section through elevation of lean-to flat roof.
Push-fit EasyFix shoes at gaps of 400mm down the length of timber battens 8 per m2 recommended. Steve from London Flat Roofing explains how warm flat roof construction works in this excellent short video. Because this design works by conserving heat no ventilation is required.
To use EPDM for a warm deck flat roof construction solid closed cell roof insulation such as Kingspan or Celotex should be placed on top of the roof deck rather than in between the rafters. I have built flat roofs in the past where the first layer of OSB was omitted and 150mm celotex was laid directly on top of the joists which were at 400mm centres. Others would treat even steeper pitches as flat roofs.
Depends on your plans. The insulation is placed below the waterproof covering and is either mechanically fixed or bitumen bonded on to the top of the deck. Warm flat roof with insulation above air gap and just under roof deck When it comes to the insulation itself you can use the standard mineral wool mineral rock-type insulation or the compressed board-type insulation eg.
Fix the deck together with helical fixings piercing each layer of the buildup including the flat roof insulation. This video shows the key features of a flat roof cold deck construction and how to draw the details to a scale of 110. Discussion in Carpenters Talk started by Adam Harrington Mar 18 2020.
Install a second layer of plywood or OSB board. The sandwich warm deck roof is the most common type of flat roof. Flat Roofs Built for a Lean-To.
A typical warm roof is shown in the sketch below. My engineer specified the nails for the bottom deck but theres nothing mentioned for the top one. A warm flat roof is formed by placing a layer of insulation over the top of the roof structure.
Types of Warm deck roof. I have 18mm OSB nailed down then 130mm PIR then 18mm OSB. Warm deck flat roofs can be constructed on most modern construction material types such as concrete timber and timber based sheets.
Hot tar and gravel. 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. Pitch Roof u-value 016 Wm2k2 Warm Deck Pitched Roof The insulation is placed over the rafters and then a felt is placed on top.
Choose what height timber batten to use paying close attention to the height of any existing door threshold. There are two forms of warm deck roof. I need to get fixings for the upper deck of my warm flat roof.
Finally install a waterproof membrane to finish off the deck and protect the build-up from wind and driven rain. Jul 03 2019 Warm deck roof. Constructing a Flat Roof Using EPDM.
Above the insulation a bitumen felt underlayment is torched on to shed water and protect the materials below. This is usually a timber boarding of some type which in turn is supported on joists. When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run-off.
The GRP manufacturer says I need 40mm penetration into the joist - so 206mm min overall length. Contrasted with the cold deck roof this construction has a much lower risk of condensation as the void will be of a comparable temperature to the roof. The insulation in a warm deck roof is installed immediately below the roof membrane on top of the roof deck usually with a vapour control layer underneath the insulation.
Sep 30 2019 hopefully quick question. Sketch 1 3 BASIC DESIGN WARM AND COLD ROOFS Householders Guide to Flat Roofing In a flat roof the waterproofing is always supported by a structural roof deck. Due to the insulation being over the top of the roof the timber structure beneath is warm which is why the term Warm Roof is formed.
Also known as the built-up roof BUR this type of flat roof features three or more layers of waterproof material mixed in an alternating fashion with hot tar and a layer of smooth stone-like gravel. Zero ventilation space is required and the construction appears stacked and compact. Inverted warm deck roof.
By moving the insulation to the outside of the structure the roof deck is effectively brought inside which results in a warm deck hence the name this removes the the possibility of condensation forming on the underside of the deck and eliminates damp.
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