Roof insulation

In a study (206) of the moisture gain of foamed plastic roof insulations under controlled thermal gradients the apparent permeabiUty values were greater than those predicted by regular wet-cup permeabiUty measurements. The moisture gains found in polyurethane are greater than those of bead polystyrene and much greater than those of extmded polystyrene. 

Commercial Construction. The same attributes desirable on residential constmction appHcations hold for commercial constmction as weU but insulation quaHty, permanence, moisture insensitivity, and resistance to free2e—thaw cycling in the presence of water are of greater significance. For this reason ceUular plastics have greater appHcation here. Both polystyrene and polyurethane foams are highly desirable roof insulations in commercial as in residential constmction. 

W. Tobiasson, A. Greatorex, and D. VanPelt, "Wetting of Styrene and Urethane Roof Insulations ia the Laboratory and on a Protected Roof Membrane," F. J. PoweU and S. L. Matthew, eds., ia Thermal Insulation Materials and Systems STP922, ASTM, Philadelphia, Pa., 1987. 

Numerous variations in composition, appHcation method and surface treatment, and properties of Mg(OH)2-containing flame-retardant fillers are disclosed in the patent Hterature (92—95). Smoke-suppressant foams incorporating Mg(OH)2 are useful as roof insulation slabs (96). Mg(OH)2 is contained... 

Metal deck assemblies are tested by UL for under-deck fire hazard by using their Steiner tunnel (ASTM E84). The assembly, exposed to an under-deck gas flame, must not allow rapid propagation of the fire down the length of the tunnel. FM uses a calorimeter fire-test chamber to evaluate the hazard of an under-deck fire. The deck is exposed to a gas flame and the rate of heat release is measured and correlated to the rate of flame propagation. A different FM test assesses the damage to roof insulations exposed to radiant heat. 

Foam glass was invented in 1942 and is a closed cell glass material blown with hydrogen sulfide gas. It is used in industrial and roof insulation applications where its extremely low moisture permeability is valuable. 

Plastic Foam Materials and Roofing Insulation, 1983-1989, Peter Sherwood Associates, Inc., White Plains, N.Y., Apr. 1984 Roofing/Siding/Insul. 61, 82 (Oct. 1984). 

D 3747 Specification for Emulsified Asphalt Adhesive for Adhering Roof Insulation... 

Polyethylene foam sheet is used mainly in package cushioning, and also in roof insulation and extruded profile is also used as construction sealants and pipe insulation. It is made mainly by tandem extrusion. The first extruder melts the polyethylene and blends in liquid volatile organic foaming agent. The second extruder cools it to the optimum foaming temperature, and pumps it through a die into room-temperature air, where it expands into foamed sheet. 

Foams for thermal protection of buildings, heating pipes, thermal barrier, films for roof insulation, shutters for heat protection... 

Figure 15-2 A three-layer treadable roof insulation...

For the thermal insulation of roofs, there is a difference between fiat roof and steep roof insulation. The insulation of a nonventilated flat roof is done with EPS insulation elements, which could, also, be pre-laminated with a sealing strip. Steep roof insulation is used in attic conversions for residential purposes. There is a difference between insulation under, on and between the rafters. For the between-rafter insulation, different systems are used to make installation very easy. Slabs from the Styrotect [125] system, tongued and grooved, are cut to size, fitted together and laid between the rafters. Also special wedge systems or the use of elasticated slabs are possible. 

The use of cellular plastics for wall and ceiling insulation of residential buildings has increased more than 200 % over the past decade. Extruded polymeric foam is found in residential construction as sheathing, perimeter and floor insulation under concrete, and combined plaster base and insulation for walls. Both polystyrene and polyurethane foams are highly desirable roof insulants. 

In industrial and commercial construction, numerous building assemblies have been used successfully for many years. As in residential insulation, roof insulation is the most effective. The roof deck is usually flat and requires new waterproofing. In conventional overdeck assembly, the insulation is located above the roof deck structure and is covered by the built-up roof. Other techniques for roof insulation include membrane assemblies (IRMA) [102], underdeck assemblies, and structural panel assemblies. 

It has been proved that pyranyl foams can be used for pour-in-place applications in household refrigerators and deep freezers. Furthermore, because of their high thermal stability the foams can withstand inunersion in molten asphalt at 205°C (400°Q. This jn-operty makes possible applications to roof insulation with molten asphalt as a water-I otecting layer. Another possible application is the baking of the enamel finish on freezer cabinets after the foam insulation has been applied. The foaming reaction is very fast, and, therefore, spraying of the foams onto out-door tanks and pipes is possible. 

ASTM C 725-88 Standard Specification for Mineral Fiber and Roof Insulation Board, 2 pp (DOD Adopted) (FSC 5640) (Comm C-16)... 

This specification applies to faced or unfaced, rigid cellular phenolic thermal insulation in either board or tubular form. Materials covered are used as roof insulation, sheathing or rigid board for non-load bearing, building material applications, and pipe insulation between -40° and 125°C (-40° and 257°F). 

Full Commercial/Industrial Market, Roof Insulation and Emerging Applications... 

Please note that those figures do not reflect roof insulation, which this year represents a potential of more than 3 billion board feet of one-inch fiberboard equivalent to 1.25 billion board feet of one-inch urethane. Ely mid-decade, we anticipate the market to grow to U billion board feet or 1.66 billion board feet of one-inch urethane. 

UltraGard Pranier. danville] Phenolic foam roof insulation. 

Asbestos Roofing/insulation/air conditioning conduits lastics ber taper Carcinogenic to workers and even family members... 

The fiiction is believed to have been caused by the buildup of sodium aerosol deposits on the inside of the liner tube and on the extension rod of the absorber in the cool region of the rotating shield, as shown in Figure 6.4. Lowering the rod moved the deposit on the guide tubes into the warmer region below the roof insulation where it melted off, reducing the friction. 

The flammability of roof insulations is examined by the Factory Mutual Class 1 Calorimeter Tesf in USA. 

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