705 Roofing provides professional attic ventilation and blown-in insulation services designed to improve energy efficiency, reduce moisture problems, and extend the life of your roof. Our attic solutions help homeowners create healthier, more efficient homes built for Ontario weather.
A properly ventilated attic allows continuous airflow to remove excess heat and moisture. Without proper ventilation, hot air and moisture can become trapped inside the attic, leading to:
Proper attic ventilation helps extend the life of your roof while improving your home’s overall efficiency and comfort.
You may have attic ventilation issues if you notice:
Proper attic insulation helps reduce heat loss and improve indoor comfort year-round. 705 Roofing installs high-quality blown-in attic insulation to help homeowners improve energy efficiency and reduce heating costs.
We can upgrade under-insulated attics to recommended insulation levels for Ontario homes.
1. Attic Inspection
We inspect your attic for:
Moisture concerns
2. Ventilation Improvements
We ensure proper intake and exhaust ventilation to improve attic airflow and reduce moisture buildup.
3. Blown-In Insulation Installation
We install blown-in insulation evenly across the attic space to ensure proper coverage and performance.
Maintaining airflow from the soffits into the attic is one of the most important parts of attic ventilation. We install attic baffles to keep insulation from blocking airflow and to improve overall roof performance.
With proper attic ventilation and insulation, homeowners can help reduce:
A balanced attic system protects both your roof and your home.
Four kinds of insulation are common in Ontario attics. Each has a place:
For most existing homes with an open attic, blown-in insulation gives the most even coverage for the money. It can also go on top of the old insulation, as long as the old material is dry, free of mould, and the inspection finds no vermiculite or other hazard.
Insulation is rated by R-value: the higher the number, the more it slows heat loss. Ontario’s energy rules for new homes call for R-50 to R-60 in an attic, with R-60 in most of the standard compliance packages. Natural Resources Canada’s guide Keeping the Heat In explains R-values and how to upgrade an older attic. Many older homes in Simcoe County have far less, because the insulation was put in when the standard was lower, or it has settled or been disturbed over the years.
A simple check: look across the attic floor. If you can see the tops of the ceiling joists, the attic is under-insulated, because the insulation should cover the joists completely. Thin or uneven spots, often near the hatch or where someone has walked, also lose heat. If you look for yourself, stay at the hatch or on solid framing, never on the drywall or the insulation, which can hide wiring and gaps. If the attic is hard to move around in, leave the check to us.
Insulation slows heat, but it does not stop air. Warm, moist air from the house leaks into the attic through gaps around pot lights, plumbing stacks, wiring holes, the attic hatch and the tops of interior walls. That air carries heat that melts snow on the roof, and moisture that turns to frost on the underside of the roof deck.
Adding insulation over these leaks hides them without stopping them. The lasting fix seals the main gaps first, then adds insulation over a tight ceiling. Some gaps need special care: chimneys, furnace flues and older pot lights that are not rated for contact with insulation need a set clearance and approved materials. Combustible insulation and ordinary foam must never be packed against them. The attic inspection is the time to find these leaks, because many of them show as dirty, stained patches in the old insulation where air has been moving through it.
An ice dam starts with a warm roof. Heat from the house warms the roof deck above the living space, the snow on top melts, and the water runs down to the eaves. The eaves hang out past the warm walls, so they stay cold, and the water freezes there. The ridge of ice grows, and the next meltwater pools behind it and can back up under the shingles.
Ventilation helps keep the roof deck cold, so less snow melts from below. A balanced system works as a pair:
Air moves in at the bottom and out at the top, and carries the heat and moisture away. Ontario’s building code sets a common minimum of 1 square foot of open vent area for every 300 square feet of attic floor, split between intake and exhaust. Low-slope roofs and some cathedral ceilings need twice that. Too much exhaust with too little intake can pull warm air up from the house instead.
Ventilation and air sealing reduce ice dams, but heavy snow, sun and cold snaps can still build some ice at the eaves. That is why the roof edge has its own protection: ice and water shield along the eaves under the shingles, and a drip edge at the edge of the roof. Our post on what a drip edge does explains how that edge works and the signs it has failed.
A roof replacement is the best time to correct attic ventilation. With the old shingles off, a ridge vent can be cut in along the peak, old box vents that no longer fit the plan can be removed and the holes decked over, and intake and exhaust can be balanced as one system. Soft or rotten plywood found at the eaves, often a sign of years of attic moisture, is replaced before the new roof goes on.
If the roof itself is sound but leaks around a vent or shows frost damage in one area, a roof repair for the leak and an attic check together can fix the cause, not only the stain.
For most existing attics in Ontario, blown-in insulation is the best fit. It fills around wiring and framing without the gaps that batts leave, and it can go on top of old insulation that is dry. Blown-in fibreglass fibres do not absorb water. Blown-in cellulose packs more densely but settles more, so it goes in a little deeper. In an existing attic, spray foam is mostly used for small, hard-to-reach areas.
The price depends on the size of the attic, how much insulation is already there, how deep the new layer must be to reach the target R-value, how easy the attic is to get into, and whether air sealing, baffles or vent changes are needed first. A free attic inspection gives a quote for your attic, not an average.
A light frost in the coldest weeks is normal. Heavy frost, about 10 mm or thicker, on the nail tips or the underside of the roof deck is a warning sign: too much moisture is reaching the cold roof. Most often the source is warm, moist air leaking up from the house, or a bathroom fan duct that leaks or ends in the attic. When it melts on a warm day, it drips onto the insulation and ceiling and can look like a roof leak. Over time it can rot the roof deck. The fix is to find the source, seal the air leaks and correct the ventilation.
Usually, yes. Blown-in insulation can be added over old batts or loose fill, as long as the old material is dry, free of mould and not hiding a leak. Wet or mouldy insulation, or old vermiculite (a pebble-like, grey-brown or silver-gold loose fill that can contain asbestos), must be dealt with first. Do not disturb vermiculite or take a sample yourself. Treat it as if it contains asbestos, and have a qualified asbestos professional assess it.
Do both, in order: seal the air leaks, put in baffles to keep the soffit intake open, make sure the attic has enough exhaust at the top, then add the insulation. Adding insulation first can bury the soffit vents and block the airflow the attic needs.
We focus on long-term attic solutions that improve both roof performance and home efficiency.
705 Roofing provides attic ventilation and blown-in insulation services in:
Call 705-770-0636 today to schedule your free attic inspection and estimate. Our team is ready to help improve your attic ventilation, insulation, and overall home efficiency.
Visit us at: https://705roofing.ca/
Your trusted roofing experts for Wasaga Beach and the surrounding Georgian Bay area.
