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It is usually advised to eliminate existing shingles when mounting new ones. Specific locations in the attic can posture serious fire and health and wellness risks. Before air sealing and shielding an attic, ensure you or your professional address the following health and wellness problems. Examine the smokeshaft and bordering mounting for signs of charring, residue down payments, crumbling masonry or mortar, or evidence that the smokeshaft lining is wearing away.


Have a chimney expert repair service, seal and shield it at the very same time. Typically a gap exists where a stonework smokeshaft travels through the attic. To air seal this location, initially mount sheet steel flashing to link this void and after that secure all the joints with a non-combustible sealant (make certain the product is ranked for this application).


An air and vapour obstacle covers the flooring of the attic room and is sealed to the joists with acoustical sealer. Factory-built steel chimneys ought to be avoided speaking to insulation by a minimum 75 mm (3 in.) unless or else specified by producer or regional authorities. Mount a non-flammable radiation guard that maintains a 75-mm (3-in.) air room in between the smokeshaft and insulation.

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The top of the radiation shield need to additionally be a minimum of 75 mm (3 in.) higher than the degree of existing or brand-new insulation to be added. To stop insulation from falling back the shield, connect a clamp-type tornado collar without sealer on top of the radiation guard, as received Figure 5-4.


A radiation obstacle creates a 75 millimetre or 3-inch air area around the smokeshaft and extends 75 millimetres or 3 inches above the attic room insulation, keeping the range from flammable materials. The top of the obstacle is a storm collar clamped, not secured, to the smokeshaft. Over the ceiling, the air and vapour barrier is covered around the drywall to call the firestop sealant.


A collar-like ceiling trim plate is attached listed below the firestop. Common indoor recessed lights are challenging to air seal properly and can come to be a fire danger if covered with insulation.

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This likewise offers the opportunity to better seal and protect the existing tooth cavity. If you locate a substantial quantity of animal droppings and vermin in the attic room, do not interrupt them since they can harbour easily air-borne moulds, bloodsucker eggs and microorganisms that can trigger extreme disease.


Seal the complying with areas: Around the pipes stack and any type of various other pipelines. For plastic pipes stacks that go up and down due to thermal expansion, use an adaptable gasket or a polyethylene sleeve sealed to a plywood collar (see Number 5-6). Around wires or ceiling lighting fixtures that permeate the attic room floor and dividers and exterior wall surface leading plates (see Number 5-7 and Figure 5-8).




Around the chimney. Structure codes need that air areas between smokeshafts and floor or ceiling assemblies whereby they pass be secured with a non-combustible fire stop (see Figure 5-3 and Figure 5-4). Along the side of common walls. There is often a space in between the party wall surface (such as the common wall surface in between units 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 sealant and stapled to the ceiling frames the electric box. An electric cable leads away from the electric box and down with an opening right into an interior wall. Openings around electric cables are loaded with caulking or foam sealant, and caulking seals spaces along the top of the interior walls.


After air securing, attic ventilation is your second line of defence versus the water vapour that may have discovered its method right into the attic. It guarantees a chillier, well-vented attic space less vulnerable to the formation of ice dams at the eaves.




You may need to situate roofing system or soffit vents from outdoors if they are not clearly noticeable from inside the attic. Homes with peaked roofings and easily accessible attics are the simplest to air vent by utilizing the proportion of 1 to 300. This proportion describes unobstructed air vent area to the shielded ceiling location.


Do not use electrical exhaust fans for attic room ventilation as these can draw extra air than can be provided with the soffit vents. This will really pull residence air right into the attic room, causing better warm loss and dampness build-up. They are also susceptible to failure, sound manufacturing and enhanced power use.

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The area of vents is as crucial as their number and kind. Commonly, a combination of types and areas will work best. The adhering to Parts information the ideal technique depending on your attic room type. After you have actually examined the attic room and performed any type of therapeutic job, focus first on air and moisture control.


On the other hand, spray foam offers air sealing and a preliminary layer of excellent quality insulation dig this that can be topped approximately the preferred RSI (R) degree (HVAC maintenance). If the attic room retrofit is being completed in combination with interior renovations, the easiest method is to set up a brand-new, single air and vapour obstacle on the bottom of the ceiling joists


Structure codes call for that air areas between chimneys and floor or ceiling assemblies via which they pass be sealed with a non-combustible fire stop (see Figure 5-3 and Figure 5-4). There is usually a space in between the celebration wall (such as the common wall in between units in duplexes, triplexes and row residences) and the side of the attic room floor.


A heavy polyethylene sheet which is caulked with acoustical sealant and stapled to the ceiling encloses the electrical box. An electrical cord leads away from the electric box and down via an opening into an indoor wall surface. Holes around electric cords are loaded with caulking or foam sealant, and caulking seals gaps along the top of the indoor walls.

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After air securing, attic air flow is your second line of protection versus the water vapour that might have found its method into the attic. It makes certain 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 outside if they are not plainly visible from inside the attic room. Residences with peaked roofings and obtainable attic rooms are the simplest to vent by utilizing the proportion of 1 to 300. This proportion refers to unobstructed vent area to the insulated ceiling area.


Also, do not utilize electrical exhaust fans for attic room air flow as these can draw extra air than can be provided via the soffit vents. This will in fact pull house air into the attic, leading to greater heat loss and moisture build-up. They are also susceptible to failure, sound manufacturing and boosted power use.


The following Parts information the finest approach depending on your attic type. After you have examined the attic and lugged out any type of therapeutic work, focus initially on air and moisture control.

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On the various other hand, spray foam offers air sealing and an initial layer of top quality insulation that can be covered as much as the preferred RSI (R) degree. If the attic retrofit is being completed combined with interior remodellings, the easiest approach is to install a new, single air and vapour obstacle on the bottom of the ceiling joists.