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It is normally recommended to eliminate existing shingles when setting up brand-new ones. Certain areas in the attic can posture significant fire and health and wellness hazards. Before air sealing and protecting an attic room, guarantee you or your service provider address the following health and safety and security problems. Check the chimney and surrounding mounting for indicators of charring, soot deposits, crumbling stonework or mortar, or evidence that the chimney lining is wearing away.


Have a chimney specialist repair work, seal and insulate it at the same time. Commonly a space exists where a masonry smokeshaft passes with the attic. To air seal this area, initially install sheet metal flashing to bridge this gap and after that seal all the joints with a non-combustible sealant (ensure the product is rated for this application).


An air and vapour obstacle covers the flooring of the attic space and is sealed to the joists with acoustical sealer. Factory-built steel chimneys should be avoided speaking to insulation by a minimum 75 mm (3 in.) unless otherwise specified by supplier or neighborhood authorities. Set up a non-flammable radiation shield that maintains a 75-mm (3-in.) air space in between the chimney and insulation.

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The top of the radiation guard should additionally be a minimum of 75 mm (3 in.) greater than the degree of existing or brand-new insulation to be added. To stop insulation from dropping behind the shield, connect a clamp-type tornado collar without sealer at the top of the radiation guard, as displayed in Number 5-4.


A radiation obstacle develops a 75 millimetre or 3-inch air area around the smokeshaft and prolongs 75 millimetres or 3 inches above the attic insulation, maintaining the range from flammable products. The top of the obstacle is a tornado collar secured, not sealed, to the chimney. Over the ceiling, the air and vapour obstacle is twisted around the drywall to get in touch with the firestop sealer.


A collar-like ceiling trim plate is affixed listed below the firestop. Standard interior recessed lights are difficult to air seal successfully and can come to be a fire risk if covered with insulation.

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This likewise uses the possibility to much better seal and protect the existing cavity. If you find a considerable quantity of pet droppings and vermin in the attic room, do not disturb them because they can harbour conveniently airborne moulds, parasite eggs and bacteria that can trigger serious illness.


Seal the following areas: Around the plumbing pile and any type of various other pipelines. For plastic pipes heaps that go up and down due to thermal expansion, use a flexible gasket or a polyethylene sleeve sealed to a plywood collar (see Number 5-6). Around wires or ceiling light fixtures that pass through the attic room flooring and dividing and exterior wall surface top plates (see Number 5-7 and Number 5-8).




Building codes call for that air rooms in between chimneys and flooring or ceiling assemblies through which they pass be secured with a non-combustible fire quit (see Figure 5-3 and Figure 5-4). There is usually a gap between the event wall (such as the common wall surface between devices in duplexes, triplexes and row homes) and the edge of the attic room floor.

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A heavy polyethylene sheet which is caulked with acoustical sealer and stapled to the ceiling encases the electric box. An electrical cable diverts from the electric box and down via an opening into an interior wall surface. Holes around electric cords are full of caulking or foam sealant, and caulking seals voids along the top of the interior wall surfaces.


After air sealing, attic room ventilation is your 2nd line of defence against the water vapour that may have found its method into the attic. It guarantees a chillier, well-vented attic room space much less vulnerable to the development of ice dams at the eaves.




You may need to locate roof covering or soffit vents from outside if they are not plainly noticeable from inside the attic. Residences with actually peaked roofing systems and obtainable attics are the most convenient check this site out to air vent by utilizing the proportion of 1 to 300. This ratio refers to unhampered vent area to the insulated ceiling area.


Do not make use of electric exhaust fans for attic air flow as these can attract more air than can be supplied through the soffit vents. This will in fact draw house air into the attic, causing higher warmth loss and wetness buildup. They are also prone to failure, sound production and boosted power usage.

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The place of vents is as crucial as their number and kind. Usually, a mixture of types and areas will work best. The following Components detail the best strategy depending upon your attic type. After you have inspected the attic and executed any kind of restorative job, emphasis initially on air and dampness control.


On the various other hand, spray foam provides air securing and a preliminary layer of high top quality insulation that can be topped approximately the preferred RSI (R) level (Radiant barriers). If the attic room retrofit is being completed combined with interior renovations, the easiest approach is to set up a brand-new, single air and vapour obstacle on the bottom of the ceiling joists


Structure codes need that air areas between smokeshafts and flooring or ceiling settings up with which they pass be sealed with a non-combustible fire quit (see Number 5-3 and Figure 5-4). There is commonly a void between the party wall surface (such as the shared wall surface between units in duplexes, triplexes and row residences) and the side of the attic floor.


A hefty polyethylene sheet which is caulked with acoustical sealant and stapled to the ceiling frames the electrical box. An electric cable leads away from the electric box and down through an opening right into an indoor wall. Openings around electrical wires are full of caulking or foam sealer, and caulking seals gaps along the top of the indoor walls.

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After air securing, attic ventilation is your second line of support versus the water vapour that may have discovered its method right into the attic room. It makes certain a cooler, well-vented attic room area much less vulnerable to the development of ice dams at the eaves.


You might have to locate roofing system or soffit vents from outdoors if they are not plainly noticeable from inside the attic room. Houses with peaked roof coverings and accessible attics are the simplest to air vent by utilizing the ratio of 1 to 300. This ratio describes unblocked air vent area to the protected ceiling area.


Do not make use of electrical exhaust fans for attic room air flow as these can draw more air than can be provided with the soffit vents. This will really pull house air right into the attic, resulting in higher heat loss and moisture buildup. They are likewise prone to failing, noise manufacturing and boosted energy use.


The following Parts detail the ideal strategy depending on your attic room kind. After you have actually examined the attic room and lugged out any kind of therapeutic job, emphasis initially on air and dampness control.

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On the other hand, spray foam offers air securing and a preliminary layer of excellent quality insulation that can be covered up to the wanted RSI (R) level. If the attic retrofit is being finished in conjunction with indoor restorations, the easiest strategy is to set up a brand-new, single air and vapour obstacle on the underside of the ceiling joists.