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It is generally suggested to get rid of existing shingles when setting up brand-new ones. Certain areas in the attic can present severe fire and health risks. Before air sealing and shielding an attic room, ensure you or your professional address the complying with health and safety issues. Inspect the chimney and bordering framing for signs of charring, soot deposits, crumbling masonry or mortar, or evidence that the chimney lining is wearing away.


Have a chimney specialist repair, seal and insulate it at the same time. Typically a gap exists where a stonework chimney passes through the attic. To air seal this location, initially mount sheet steel flashing to bridge this gap and afterwards secure all the joints with a non-combustible sealant (guarantee the product is ranked for this application).


An air and vapour obstacle covers the floor of the attic room space and is secured to the joists with acoustical sealant.

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The top of the radiation guard should likewise be a minimum of 75 mm (3 in.) more than the level of existing or new insulation to be included. To stop insulation from falling back the guard, attach a clamp-type storm collar without sealant on top of the radiation shield, as shown in Figure 5-4.


A radiation obstacle develops a 75 millimetre or 3-inch air space around the chimney and prolongs 75 millimetres or 3 inches over the attic room insulation, preserving the range from flammable products. The top of the barrier is a tornado collar clamped, not sealed, to the smokeshaft. Above the ceiling, the air and vapour obstacle is covered around the drywall to get in touch with the firestop sealer.


A collar-like ceiling trim plate is attached below the firestop. Job safely around electrical wiring (turn off the power). Talk to an electrical specialist if questionable wiring or corroded electrical connections exist. Standard interior recessed lights are tough to air seal successfully and can come to be a fire threat if covered with insulation.

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This also uses the chance to far better seal and shield the existing cavity. If you find a considerable amount of animal droppings and vermin in the attic room, do not disrupt them because they can harbour quickly air-borne moulds, bloodsucker eggs and bacteria that can cause severe illness.


Seal the adhering to locations: Around the pipes pile and any type of other pipes. For plastic plumbing stacks that go up and down due to thermal growth, make use of a versatile gasket or a polyethylene sleeve sealed to a plywood collar (see Figure 5-6). Around wires or ceiling light components that permeate the attic floor and dividing and exterior wall leading plates (see Number 5-7 and Figure 5-8).




Around the chimney. Building ordinance call for that air spaces between smokeshafts and floor or ceiling assemblies whereby they pass be secured with a non-combustible fire stop (see Number 5-3 and Number 5-4). Along the side of common walls. There is often a space between the party wall surface (such as the shared wall in between devices in duplexes, triplexes and row residences) and the edge of the attic room floor.

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A heavy polyethylene sheet which is caulked with acoustical sealant and stapled to the ceiling frames the electrical box. An electrical cable leads away from the electrical box and down through an opening into an indoor wall surface. Holes around electrical wires are loaded with caulking or foam sealant, and caulking seals spaces along the top of the indoor wall surfaces.


After air securing, attic room air flow is your look at more info 2nd line of defence against the water vapour that may have located its way into the attic room. It guarantees a cooler, well-vented attic room space less susceptible to the development of ice dams at the eaves.




You might need to situate roof or soffit vents from outside if they are not plainly visible from inside the attic room. Homes with peaked roofing systems and easily accessible attic rooms are the simplest to vent by utilizing the proportion of 1 to 300. This ratio describes unobstructed air vent area to the protected ceiling area.


Do not use electric exhaust followers for attic room ventilation as these can attract extra air than can be supplied via the soffit vents. This will really pull home air into the attic, leading to higher heat loss and moisture buildup. They are also vulnerable to failure, sound production and boosted energy usage.

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The complying with Parts information the best method depending on your attic kind. After you have actually evaluated the attic and lugged out any restorative work, focus initially on air and wetness control.


On the other hand, spray foam uses air sealing and a first layer of top quality insulation that can be topped up to the preferred RSI (R) level (Spray foam insulation). If the attic retrofit is being finished combined with interior restorations, the easiest technique is to install a new, solitary air and vapour barrier on the underside of the ceiling joists


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


A hefty polyethylene sheet which is caulked with acoustical sealant and stapled to the ceiling encases the electric box. An electric wire leads away from the electric box and down through a hole right into an interior wall. Holes around electric wires are loaded with caulking or foam sealer, and caulking seals voids along the top of the interior wall surfaces.

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After air sealing, attic air flow is your second line of protection versus the water vapour that may have discovered its method right into the attic. It ensures a colder, well-vented attic room space less prone to the formation of ice dams at the eaves.


You might need to locate roof or soffit vents from outdoors if they are not clearly noticeable from inside the attic. Residences with peaked roofing systems and available attic rooms are the simplest to air vent by utilizing the proportion of 1 to 300. This ratio refers to unhampered vent location to the protected ceiling area.


Do not use electric exhaust fans for attic ventilation as these can draw extra air than can be supplied via the soffit vents. This will in fact pull house air right into the attic, causing greater heat loss and moisture accumulation. They are additionally susceptible to failing, noise production and increased energy use.


The adhering to Parts information the ideal method depending on your attic kind. After you have actually evaluated the attic and brought out any restorative job, emphasis initially on air and dampness control.

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On the various other hand, spray foam offers air sealing and a preliminary layer of premium quality insulation that can be topped up to the preferred RSI (R) level. If the attic retrofit is being finished combined with indoor remodellings, the easiest strategy is to set up a brand-new, single air and vapour obstacle on the underside of the ceiling joists.