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It is generally advised to eliminate existing roof shingles when installing new ones. Particular locations in the attic can posture serious fire and health and wellness dangers. Before air sealing and insulating an attic room, ensure you or your specialist address the following health and wellness and safety worries. Examine the chimney and surrounding mounting for signs of charring, soot deposits, crumbling stonework or mortar, or evidence that the chimney lining is weakening.


Have a chimney specialist repair service, seal and shield it at the exact same time. Typically a gap exists where a masonry chimney passes with the attic room. To air seal this area, initially install sheet metal blinking to bridge this void and afterwards seal all the joints with a non-combustible sealant (ensure the product is ranked for this application).


An air and vapour obstacle covers the floor of the attic area and is secured to the joists with acoustical sealer.

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The top of the radiation shield should also be a minimum of 75 mm (3 in.) greater than the degree of existing or new insulation to be included. To prevent insulation from dropping behind the guard, affix a clamp-type tornado collar without sealant on top of the radiation shield, as shown in Figure 5-4.


A radiation barrier develops a 75 millimetre or 3-inch air area around the chimney and expands 75 millimetres or 3 inches above the attic room insulation, preserving the distance from combustible products. The top of the obstacle is a storm collar secured, not sealed, to the chimney. Above the ceiling, the air and vapour barrier is wrapped around the drywall to get in touch with the firestop sealant.


A collar-like ceiling trim plate is connected below the firestop. Common interior recessed lights are tough to air seal efficiently and can come to be a fire threat if covered with insulation.

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As an option to traditional recessed or pot lights take into consideration light-emitting diode (LED) flush or flat mount components for much better power effectiveness. This likewise supplies the opportunity to much better seal and protect the existing cavity. Make certain that fixture installation guidelines are adhered to. If you discover a considerable amount of animal droppings and vermin in the attic, do not interrupt them due to the fact that they can harbour quickly air-borne moulds, bloodsucker eggs and bacteria that can create extreme health problem.


Seal the adhering to locations: Around the pipes pile and any type of various other pipelines. For plastic pipes heaps that move up and down because of thermal expansion, use a versatile gasket or a polyethylene sleeve sealed to a plywood collar (see Figure 5-6). Around wires or ceiling light components that pass through the attic flooring and dividing and outside wall surface leading plates (see Figure 5-7 and Number 5-8).




Around the smokeshaft. Structure codes call for that air areas in between chimneys and floor or ceiling assemblies via which they pass be secured with a non-combustible fire stop (see Number 5-3 and Number 5-4). Along the edge of shared wall surfaces. There is commonly a void between the event wall surface (such as the shared wall in between units in duplexes, triplexes and row houses) and the edge of the attic flooring.

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


Attic air flow serves a number of purposes. It reduces summer season warm buildup, lengthening the life link of roof and reduces air conditioner tons. After air sealing, attic ventilation is your 2nd line of defence versus the water vapour that might have found its means into the attic room - Solar attic fans. It guarantees a chillier, well-vented attic room much less prone to the development of ice dams at the eaves.




You may need to find roofing or soffit vents from outdoors if they are not plainly noticeable from inside the attic. Homes with peaked roofing systems and available attic rooms are the simplest to vent by utilizing the ratio of 1 to 300. This proportion describes unblocked air vent location to the shielded ceiling area.


Also, do not utilize electric exhaust followers for attic room ventilation as these can attract more air than can be supplied through the soffit vents. This will in fact draw house air right into the attic room, resulting in better heat loss and moisture buildup. They are likewise vulnerable to failing, noise production and enhanced power use.

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The following Parts information the ideal approach depending on your attic kind. After you have inspected the attic room and brought out any kind of remedial work, focus first on air and moisture control.


On the other hand, spray foam uses air securing and an initial layer of top quality insulation that can be covered approximately the wanted RSI (R) level (HVAC installation). If the attic room retrofit is being finished along with interior restorations, the simplest approach is to mount a new, single air and vapour barrier on the bottom of the ceiling joists


Structure codes call for that air spaces between chimneys and flooring or ceiling assemblies through which they pass be sealed with a non-combustible fire stop (see Figure 5-3 and Figure 5-4). There is frequently a void in between the celebration wall surface (such as the shared wall between devices in duplexes, triplexes and row houses) and the edge of the attic room floor.


A heavy polyethylene sheet which is caulked with acoustical sealant and stapled to the ceiling encloses the electric box. An electrical cable diverts from the electrical box and down via a hole into an indoor wall surface. Holes around electric cables are loaded with caulking or foam sealant, and caulking seals spaces along the top of the indoor wall surfaces.

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After air securing, attic ventilation is your second line of protection versus the water vapour that may have found its way right into the attic room. It makes sure a chillier, well-vented attic space much less susceptible to the formation of ice dams at the eaves.


You may have to situate roofing system or soffit vents from outdoors if they are not plainly noticeable from inside the attic room. Homes with peaked roof coverings and accessible attics are the most convenient to air vent by making use of the ratio of 1 to 300. This ratio describes unobstructed air vent area to the insulated ceiling location.


Also, do not use electric exhaust followers for attic ventilation as these can attract a lot more air than can be provided via the soffit vents. This will actually draw house air right into the attic, causing higher heat loss and dampness accumulation. They are also vulnerable to failure, sound production and increased power use.


The place of vents is as essential as their number and type. Usually, a mix of types and places will certainly work best. The following Parts information the best approach depending on your attic kind. After you have inspected the attic and performed any remedial job, emphasis initially on air and dampness control.

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On the various other hand, spray foam provides air securing and a preliminary layer of top quality insulation that can be covered as much as the preferred RSI (R) level. If the attic room retrofit is being completed along with indoor remodellings, the most convenient technique is to install a brand-new, single air and vapour barrier on the underside of the ceiling joists.