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It is generally recommended to remove existing shingles when installing brand-new ones. Certain areas in the attic room can pose major fire and health dangers. Before air sealing and protecting an attic room, ensure you or your contractor address the complying with health and wellness worries. Examine the chimney and surrounding mounting for indicators of charring, soot down payments, crumbling stonework or mortar, or proof that the chimney lining is weakening.


Have a chimney expert repair work, seal and insulate it at the same time. Typically a space exists where a masonry chimney travels through the attic. To air seal this area, first 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 barrier covers the flooring of the attic room room and is secured to the joists with acoustical sealant. Factory-built steel chimneys need to be kept from getting in touch with insulation by a minimum 75 mm (3 in.) unless otherwise specified by manufacturer or local authorities. Install a non-flammable radiation guard that maintains a 75-mm (3-in.) air area between the chimney and insulation.

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The top of the radiation shield need to likewise be a minimum of 75 mm (3 in.) more than the degree of existing or new insulation to be included. To stop insulation from falling back the guard, connect a clamp-type tornado collar without sealer at the top of the radiation guard, as shown in Figure 5-4.


A radiation obstacle produces a 75 millimetre or 3-inch air room around the chimney and expands 75 millimetres or 3 inches above the attic room insulation, preserving the range from combustible products. The top of the barrier is a tornado collar clamped, not secured, to the chimney. Over the ceiling, the air and vapour obstacle is covered around the drywall to call the firestop sealant.


A collar-like ceiling trim plate is attached listed below the firestop. Work securely around electric wiring (shut off the power). Seek advice from an electric specialist if suspicious electrical wiring or corroded electric connections are present. Basic interior recessed lights are challenging to air seal efficiently and can become a fire danger if covered with insulation.

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This additionally provides the opportunity to much better seal and shield the existing tooth cavity. If you locate a significant quantity of pet droppings and vermin in the attic, do not disturb them due to the fact that they can harbour quickly air-borne moulds, parasite eggs and germs that can trigger severe ailment.


Seal the following locations: Around the pipes stack and any kind of other pipes. For plastic plumbing heaps that go up and down due to thermal growth, make use of a flexible gasket or a polyethylene sleeve sealed to a plywood collar (see Figure 5-6). Around cords or ceiling lighting fixtures that penetrate the attic flooring and dividing and exterior wall leading plates (see Number 5-7 and Number 5-8).




Building codes need that air spaces between chimneys and floor or ceiling assemblies with which they pass be secured with a non-combustible fire stop (see Figure 5-3 and Number 5-4). There is often a gap between the celebration wall surface (such as the common wall between units in duplexes, triplexes and row homes) and the edge of the attic flooring.

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A hefty polyethylene sheet which is caulked with acoustical sealant and stapled to the ceiling encases the electric box. An electrical wire diverts from the electrical box and down through an opening into an interior wall. Openings around electrical wires are loaded with caulking or foam sealant, and caulking seals gaps along the top of the indoor walls.


After air securing, attic ventilation is your 2nd line of defence versus the water vapour that might have found its means into the attic. It ensures a chillier, well-vented attic room room less susceptible to the development of ice dams at the eaves.




You might need to situate roofing system or soffit vents from outside if they are not clearly visible from inside the attic. Homes with peaked roofings and accessible attic rooms are the easiest to vent by utilizing the proportion of 1 to 300. This proportion describes unobstructed vent location to the insulated ceiling area.


Likewise, do not utilize electric exhaust fans for attic room air flow as these can attract extra air than can be supplied with the soffit vents. This will really draw residence air into the attic, causing better heat loss and wetness build-up. They are likewise vulnerable to failure, noise production and enhanced energy use.

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The adhering to Parts information the best strategy depending on your attic kind. After you have evaluated the attic room and carried out any kind of remedial job, focus initially on air and moisture control.


On the various other hand, spray foam uses air sealing and a first layer of excellent quality insulation that can be topped as much as the desired RSI (R) degree (Attic insulation). If the attic room retrofit is being completed combined with interior improvements, the easiest strategy is to mount a new, solitary air and vapour obstacle on the bottom of the ceiling joists


Around the smokeshaft. Structure codes require that air rooms between chimneys and flooring or ceiling settings up where they look at this web-site pass be sealed with a non-combustible fire quit (see Figure 5-3 and Number 5-4). Along the side of shared wall surfaces. There is often a void in between the celebration wall (such as the common wall in between systems in duplexes, triplexes and row houses) and the side of the attic flooring.


A heavy polyethylene sheet which is caulked with acoustical sealer and stapled to the ceiling frames the electrical box. An electrical cord diverts from the electric box and down with a hole right into an interior wall surface. Holes around electric cables are loaded with caulking or foam sealer, and caulking seals spaces along the top of the indoor walls.

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Attic ventilation offers a variety of purposes. It decreases summer season warmth buildup, extending the life of roof and lowers air conditioner loads. After air sealing, attic ventilation is your second line of support versus the water vapour that might have located its means right into the attic. It guarantees a chillier, well-vented attic area much less susceptible 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 clearly noticeable from inside the attic room. Houses with peaked roofings and available attic rooms are the easiest to air vent by utilizing the ratio of 1 to 300. This proportion refers to unhampered air vent location to the protected ceiling area.


Also, do not utilize electrical exhaust fans for attic room air flow as these can draw more air than can be supplied through the soffit vents. This will actually draw residence air into the attic, causing higher heat loss and dampness buildup. They are likewise prone to failing, noise production and raised energy use.


The following Parts detail the finest technique depending on your attic room kind. After you have actually evaluated the attic room and lugged out any kind of remedial job, emphasis initially on air and dampness control.

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On the other hand, spray foam provides air sealing and a first layer of excellent quality insulation that can be covered as much as the desired RSI (R) degree. If the attic room retrofit is being completed together with interior restorations, the simplest method is to install a brand-new, single air and vapour barrier on the bottom of the ceiling joists.