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It is usually suggested to remove existing roof shingles when mounting new ones. Specific areas in the attic room can pose major fire and wellness dangers. Prior to air sealing and protecting an attic room, ensure you or your professional address the adhering to health and safety issues. Examine the chimney and surrounding framing for indications of charring, soot deposits, falling apart stonework or mortar, or proof that the smokeshaft cellular lining is weakening.


Have a smokeshaft specialist repair, seal and insulate it at the same time. Typically a space exists where a masonry smokeshaft passes through the attic. To air seal this location, initially mount sheet steel flashing to link this void and afterwards secure all the joints with a non-combustible sealer (make certain the item is ranked 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 smokeshafts should be maintained from contacting insulation by a minimum 75 mm (3 in.) unless or else defined by maker or neighborhood authorities. Set up a non-flammable radiation shield that maintains a 75-mm (3-in.) air space between the smokeshaft 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 new insulation to be included. To avoid insulation from dropping behind the guard, affix a clamp-type storm collar without sealer on top of the radiation shield, as received Figure 5-4.


A radiation obstacle creates a 75 millimetre or 3-inch air area around the chimney and prolongs 75 millimetres or 3 inches over the attic insulation, maintaining the range from flammable materials. The top of the obstacle is a storm collar clamped, not secured, to the chimney. Over the ceiling, the air and vapour obstacle is wrapped around the drywall to speak to the firestop sealant.


A collar-like ceiling trim plate is affixed below the firestop. Job safely around electrical circuitry (turn off the power). Speak with an electrical professional if suspicious wiring or corroded electric connections exist. Common interior recessed lights are challenging to air seal properly and can become a fire danger if covered with insulation.

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As an option to conventional recessed or pot lights consider light-emitting diode (LED) flush or level mount components for much better power effectiveness. This also supplies the chance to better seal and protect the existing cavity. Make certain that fixture installment directions are adhered to. If you discover a substantial amount of pet droppings and vermin in the attic room, do not disturb them since they can harbour easily airborne moulds, bloodsucker eggs and germs that can create serious illness.


Seal the following areas: Around the pipes pile and any other pipelines. For plastic pipes heaps that relocate up and down due to thermal growth, utilize an adaptable gasket or a polyethylene sleeve sealed to a plywood collar (see Figure 5-6). Around cables or ceiling light components that penetrate the attic floor and dividing and exterior wall surface top plates (see Number 5-7 and Number 5-8).




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

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A hefty polyethylene sheet which is caulked with acoustical sealer and stapled to the ceiling encloses the electrical box. An electric cable leads away from the electric box and down with an opening into an interior wall surface. Holes around electric cables are full of caulking or foam sealer, and caulking seals spaces along the top of the interior wall surfaces.


After air sealing, attic room air flow is your second line of support versus the water vapour that may have discovered its means into the attic. It makes sure a colder, well-vented attic area much less prone to the formation of ice dams at the eaves.




You might need to situate roof covering or soffit vents from outside if they are not clearly noticeable from inside the attic room. Houses with peaked roof coverings and obtainable attic rooms are the simplest to vent by making use of the ratio of 1 to 300. This proportion refers to unobstructed vent location to the protected ceiling location.


Do not utilize electric exhaust fans for attic ventilation as these can draw a lot more air than can be provided through the soffit vents. This will in fact draw residence air right into the attic room, causing better warmth loss and moisture build-up. They are also vulnerable to failing, noise production and increased power usage.

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The area of vents is as important as their number and kind. Commonly, a mixture of kinds and places will certainly function best. The following Parts detail the most effective technique depending on your attic room type. After you have actually evaluated the attic and executed any remedial job, emphasis first on air and moisture control.


On the various other hand, spray foam provides air securing and an initial layer of high quality insulation that can be covered up to the preferred RSI (R) degree (HVAC maintenance). If the attic retrofit is being completed combined with indoor remodellings, the most convenient approach is to set up a brand-new, solitary air and vapour obstacle on the bottom of the ceiling joists


Structure codes need that air spaces in between chimneys and flooring or ceiling assemblies through which they pass be sealed with a non-combustible fire stop (see Number 5-3 and Number 5-4). There is commonly a gap in between the celebration wall surface (such as the shared wall surface between devices in duplexes, triplexes and row homes) and the side of the attic flooring.


A heavy polyethylene sheet which is caulked with acoustical sealer and stapled to the ceiling encases the electric box. An electrical cord leads away from the electric box and down with an opening into an interior wall surface. Holes around electric cables are full of caulking or foam sealer, and caulking seals gaps along the top of the indoor wall surfaces.

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After air sealing, attic ventilation is your second line of support against the water vapour that may have discovered its method into the attic. It makes sure a chillier, well-vented attic room area much less susceptible to the formation go right here of ice dams at the eaves.


You may have to locate roofing or soffit vents from outside if they are not clearly visible from inside the attic. Houses with peaked roofs and available attics are the easiest to vent by utilizing the ratio of 1 to 300. This ratio describes unhampered vent location to the insulated ceiling area.


Also, do not use electric exhaust fans for attic ventilation as these can draw much more air than can be supplied with the soffit vents. This will actually draw home air into the attic room, leading to greater warmth loss and dampness build-up. They are also vulnerable to failure, noise manufacturing and enhanced energy usage.


The adhering to Components information the ideal approach depending on your attic type. After you have inspected the attic and carried out any type of restorative work, focus first on air and moisture control.

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On the various other hand, spray foam supplies air securing and a preliminary layer of high quality insulation that can be covered approximately the preferred RSI (R) level. If the attic retrofit is being finished combined with interior renovations, the most convenient strategy is to mount a new, single air and vapour obstacle on the bottom of the ceiling joists.