2 edition of Moisture in a timber-based flat roof of cold deck construction. found in the catalog.
Moisture in a timber-based flat roof of cold deck construction.
I. S. McIntyre
|Series||Information paper / Building Research Establishment -- 35/79, Information paper (Building Research Establishment) -- 35/79.|
|Contributions||Building Research Establishment.|
By Rupert Pool, Principal Consultant, BRE Building Technology Group. Dripping from roofs into the rooms below is often caused by a build-up of condensation in the cold roof voids, rather than by leaks which may initially be suspected. At BRE we regularly investigate roofs from which water is dripping into the rooms below. Asphalt-Applied and Cold Application Built-Up Roofing Application Guide These specifications are also for use over JM roof insulations (Fesco, Tapered Fesco, Fesco Foam, Tapered Fesco Foam, ENRGY 3, Tapered ENRGY 3 and ½” [13 mm] Retro-Fit Board) or other approved insulations that offer a suitable surface to receive the roof.
Lead sheet, one of the oldest and most durable roofing materials, has been known to last for over years. However, even with the best of materials, poor design often leads to failure. One particular problem which has been the subject of increasing concern, speculation and debate, is the tendency for condensation on the underside of metal. Obvious or unforeseen, roof problems are always a pain and undoubtedly a significant expense. BUILDINGS magazine examined which problems are most common and the conditions that can either cause or be the result of premature failure and reduced service life of low-slope roof systems. This is not a self-diagnostic guide, but rather an informative list of some of the problems most often battled.
CHAPTER 15 ROOF ASSEMBLIES AND ROOFTOP STRUCTURES. CHAPTER 16 STRUCTURAL DESIGN. CHAPTER 17 SPECIAL INSPECTIONS AND TESTS. CHAPTER 18 SOILS AND FOUNDATIONS. CHAPTER 19 CONCRETE. CHAPTER 20 ALUMINUM. CHAPTER 21 MASONRY. CHAPTER 22 STEEL. CHAPTER 23 WOOD. CHAPTER 24 GLASS AND GLAZING. CHAPTER 25 . Although cold roof systems were used extensively in the past, they are now considered out of date and are highly inadvisable. In fact, insulation from the inside will inevitably lead to the formation of condensation caused by the humidity present inside the building. As a consequence: the insulation will quickly become saturated with water and.
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This chapter examines the general principles involved in the design of roofs; the various forms of construction and coverings; Moisture in a timber-based flat roof of cold deck construction.
HMSO () Buy this book on publisher's site; Personalised recommendations. BRE Information Paper 35/ Moisture in a timber-based flat roof of cold deck construction () Google Scholar BRE Digest Cavity barriers and ventilation in flat.
While a well-installed flat or low slope roof can keep outside rain or snow-melt out of the building, water entering the roof cavity from inside the building in the form of water vapor.
Moisture in a timber-based flat roof of cold deck construction: IP 11// Maintenance costs of flat roofs: IP 26/ Solar reflective paints: IP 15/ Inspection and maintenance of flat and low-pitch timber roofs: IP 19/ Consideration in the design of timber flat roofs: IP 13/ Ventilating cold deck.
A flat roof usually consists of the following: Waterproof membrane to prevent water penetrating the structure and interior of the building. Roof deck, providing the base for the waterproof membrane, and in some cases the insulation. Thermal insulation.
Load bearing or primary structure, usually constructed in timber in a residential construction. • Cold deck. Warm Deck Roof With this type of roof the insulation is placed above the roof deck but below the weatherproofing. There should be no insulation below the deck and no ventilation is required.
Some forms of roof decking may also have insulation bonded to them. The external wall insulation needs to be extended up to the underside of the roof insulation to prevent cold Size: 37KB. Ice and water shield being installed at the bottom meter of a shingled roof. Note that it is lapped UNDER the roofing paper to promote drainage.
This extra membrane is thicker and more durable than roofing paper and is meant to prevent water leakage due to “ice dams” at the end of the Size: 5MB.
Previously, the cold deck method of flat roof construction was favoured. However, with changes in how people live and how properties are utilised, this has now changed. Constructing a Flat Roof Using EPDM. Warm deck flat roofs can be constructed on most modern construction material types such as concrete, timber and timber based sheets.
Flat roof: A roof with a maximum slope of 10° from the horizontal. Systems may be used at a greater pitch where they meet the requirements of this chapter, and materials are adequately held in place. Deck: The structural substrate of the flat roof.
Decking: The upper trafficked surface of the balcony. Warm roof: Insulated above the deck. Cold roof. Figure 1: The National Roof Contractors Association (NRCA) map. Image courtesy Professional Roofing. According to NRCA, dew point calculations are necessary whenever the outside average January temperature is below 4 C (40 F), and when the expected interior winter RH is.
On standard timber-based hybrid roofs, the below-deck insulation is typically cut to size and slotted between the joists. Specifiers should make certain that there is an adequate attachment method for the insulation, if a steel or concrete roof deck forms part of the hybrid roof structure.
In a cold deck design it is very important to have good air flow that will allow warm moist air to escape. Condensation can lead to rotting deck and ceiling joists and also cause damp insulation and ceilings. Good external ventilation should be installed in the form of soffit vents.
EPDM Warm Deck The Warm deck roof design is the modern construction method for flat roofs and is preferred wherever this. Moisture can be the nemesis of today’s more tightly-built wood-framed homes. Creating a tight building envelope is only one part of the equation in creating a high-performing, energy-efficient house — if it’s not coupled with strategies for letting accumulated moisture out of wall cavities, it can be a recipe for disaster.
For several years, NAHB’s Building Product Issues Committee. In flat roof construction thermal insulation can be placed above and below the structural roof deck or waterproofing layer. When placed below the structural deck; ventilation is required to the underside of the deck. This ‘cold deck’ construction is considered problematic in the humid, Author: Charles Stirling.
In a flat roof, the waterproofing is always supported by a structural roof deck. This mostly takes the form of timber based boarding of some type, which in turn is supported on joists. The ceiling will usually be fixed directly to the underside of the joists.
Leaks and moisture – Probably the most common problems with flat roofs, leaks and lingering moisture are issues that can be dealt with effectively, as long as you stay on top of them. Just like any roof, a flat roof will develop leaks, but since it’s flat, the water. Underneath the basics, flat roofs are usually constructed with a ceiling, nailed to joists which support a deck (usually wood in residential construction), a vapor barrier, insulation and a roof board.
From there, the flat roof system you choose will determine the materials you apply. It is for that reason that the Flat Roof Construction Manual focuses on the subject of designing energy-saving flat roofs free from damage. as the loadbearing deck to a flat roof instead of.
The deck must be dry, clean and primed as necessary before laying the waterproofing and insulating system to ensure good adhesion. The material used for the roof deck must be moisture resistant and will usually be plywood, OSB or timber boards although concrete.
Warm Flat Roofing: This approach uses insulation with no air gap either immediately above or below the roof deck. A vapour control layer must be used below the insulation.
This option avoids the requirement to ventilate the roof. Cold Flat Roofing: This is where the insulation is typically packed between the rafters. A 50mm air gap must be left. The volume may increase up to 20 to 40% when moisture content is 5 to 10 %. Due to moisture in each particle of sand, sand gets a coating of water due to surface tension which keeps the particles apart.
The deck of a flat roof can be constructed from metal, timber or concrete. Timber and metal decks are normally sheeted with plywood, OSB (oriented strand board), or sometimes chipboard.
This deck is then covered with sarking material, then finally the finishing material to provide weathering.The fall of the roof is achieved by using firring pieces, with a fall of 1 in The flat roof shown above shows Warm Deck Roof Construction.
In this type of construction the insulation is placed below the waterproof covering and on top of the roof deck and vapour barrier. This ensures that the deck holds a warm temperature during the winter.