Green Attics - Questions

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Certain areas in the attic can pose major fire and health and wellness threats. Prior to air securing and shielding an attic, ensure you or your service provider address the adhering to wellness and safety and security concerns.


Have a chimney professional fixing, seal and shield it at the very same time. Commonly a void exists where a stonework chimney passes through the attic. To air seal this location, first install sheet metal flashing to bridge this gap and after that seal all the joints with a non-combustible sealant (guarantee the product is ranked for this application).


An air and vapour barrier covers the floor of the attic room room and is sealed to the joists with acoustical sealant. Factory-built metal smokeshafts must be avoided speaking to insulation by a minimal 75 mm (3 in.) unless otherwise defined by supplier or regional authorities. Mount a non-flammable radiation shield that preserves a 75-mm (3-in.) air space in between the smokeshaft and insulation.

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The top of the radiation guard need to likewise be a minimum of 75 mm (3 in.) greater than the level of existing or new insulation to be included. To stop insulation from falling behind the shield, affix a clamp-type tornado collar without sealant at the top of the radiation guard, as revealed in Figure 5-4.


A radiation obstacle creates a 75 millimetre or 3-inch air area around the smokeshaft and expands 75 millimetres or 3 inches above the attic room insulation, keeping the distance from combustible materials. The top of the obstacle is a storm collar clamped, not sealed, to the chimney. Over the ceiling, the air and vapour obstacle is twisted around the drywall to call the firestop sealer.


A collar-like ceiling trim plate is connected listed below the firestop. Job securely around electric circuitry (turn off the power). Consult with an electrical contractor if doubtful circuitry or rusty electric links exist. Typical indoor recessed lights are difficult to air seal effectively and can become a fire threat if covered with insulation.

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This also offers the chance to far better seal and shield the existing cavity. If you find a significant quantity of pet droppings and vermin in the attic room, do not disrupt them due to the fact that they can harbour quickly airborne moulds, bloodsucker eggs and microorganisms that can cause serious health problem.


Seal the adhering to locations: Around the plumbing stack and any type of other pipes. For plastic plumbing heaps that relocate up and down as a result of thermal development, make use of an adaptable gasket or a polyethylene sleeve secured to a plywood collar (see Number 5-6). Around cords or ceiling lighting fixtures that permeate the attic floor and partition and outside wall surface leading plates (see Figure 5-7 and Figure 5-8).




Building codes require that air rooms between chimneys and flooring or ceiling assemblies through which they pass be secured with a non-combustible fire stop (see Figure 5-3 and Figure 5-4). There is often a space between the event wall surface (such as the shared wall surface between systems in duplexes, triplexes and row houses) and the side of the attic flooring.

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


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




You may need to locate roofing or soffit vents from outside if they are not clearly noticeable from inside the attic. Houses with actually peaked roofs and easily accessible attics are the most convenient to air vent by utilizing the ratio of 1 to 300. This proportion refers to unobstructed air vent location to the insulated ceiling area.


Likewise, do not use electric exhaust followers for attic room ventilation as these can draw more air than can be supplied with the soffit vents. This will really draw home air right into the attic, leading to better heat loss and moisture build-up. They are additionally prone to failure, noise production and increased energy use.

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The location of vents is as vital as their number and type. Usually, a blend of kinds and areas will work best. The following Components information the very best technique relying on your attic type. After you have examined the attic room and performed any type of restorative work, emphasis initially on air and moisture control.


On the various other hand, spray foam uses air sealing and a first layer of high quality insulation that can be covered up to the wanted RSI (R) level (Home energy efficiency). If the attic retrofit is being finished in conjunction with interior renovations, the most convenient technique is to install a brand-new, single air and vapour obstacle on the bottom of the ceiling joists


Around the smokeshaft. Building regulations call for that air rooms in between smokeshafts and floor or ceiling assemblies where they pass be sealed with a non-combustible fire stop (see Figure 5-3 and Number 5-4). Along the edge of shared wall surfaces. There is typically a gap in between the event wall surface (such as the common wall surface between units in duplexes, triplexes and row residences) and the edge of the attic room floor.


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

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Attic ventilation serves a number of objectives. It reduces summer warmth build-up, prolonging the life of roof and minimizes a/c lots. After air securing, attic air flow is your second line of defence against the water vapour that may have discovered its means into the attic. It makes sure a chillier, well-vented attic room space less susceptible to the development of ice dams at the eaves.


You may have to situate roofing system or soffit vents from outside if they are not clearly noticeable from inside the attic room. Houses with peaked roofing systems and easily accessible attics are the easiest to air vent by utilizing the proportion of 1 to 300. This ratio refers to unobstructed air vent location to the shielded ceiling location.


Likewise, do not use electrical exhaust followers for attic ventilation as these can attract more air than can be provided via the soffit vents. This will really pull house air right into the attic, resulting in higher heat loss and dampness buildup. They are likewise susceptible to failure, noise manufacturing and boosted energy usage.


The complying with Components information the finest my blog technique depending on your attic type. After you have examined the attic and carried out any therapeutic work, focus first on air and moisture control.

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On the various other hand, spray foam uses air sealing and a first layer of top quality insulation that can be topped approximately the preferred RSI (R) level. If the attic room retrofit is being completed in combination with interior renovations, the easiest strategy is to set up a brand-new, single air and vapour obstacle on the bottom of the ceiling joists.