Official web site of the Toitures O Sec professional roofing company in Montreal - Certified and insured roof shingle installation
Products - Our many options of roofing materials, roof shingle replacement brand choices and colours - We service the greater Montreal, Dorval, West-Island , Beaconsfield, Pincourt, Vaudreuil, Baie d'Urfe, Pointe-Claire areas for roof repair, replacement and new installationsRoof services company with professional and insured roofers for all your roofing installation needsVentilation - Roofing ventilation, soffit product choices for repairs and new installations on residential roofsCertification - Our work is certified and insured for safe and durable repairs on your homes roof - We service the greater Montreal areaCommon Roof problems repairs - Solutions to common and difficult problemsBenefits of using our professional, insured and certified services for your roof repairs and installationsFAQ - Frequent questions and answers to your roof problems, roof repair and installation issuesContact us for your roofing, ventilation needs - Roof repair or new complete roof replacement and shingle installations
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VENTILATION - Ventilators made by VENMAR for flat or sloped roofs
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60100
60110
60300
60310
60350
Attic Ventilator for sloped roofs  Attic Ventilator for
flat roofs 
Attic ventilator for sloped roof  Attic ventilator for
flat roofs
Attic ventilator for existing round base 
Exclusive multi-slope base; ideal for sloped roofs. Single opening provides ventilation for limited areas 
Innovative design prevents snow and rain infiltration 
Discreet look Innovative seamless cap can easily replace traditional roof vents
Designed for flat roofs. Single opening provides ventilation for limited areas 
Innovative design prevents snow and rain infiltration 
Discreet look Innovative seamless cap Ideal to replace goosenecks
Exclusive multi-slope base; ideal for sloped roofs. Three openings provide superior ventilation 
Innovative design prevents snow and rain infiltration 
Discreet look Innovative seamless cap Can easily replace traditional roof vents
Designed for flat roofs. Three openings provide superior ventilation 
Innovative design prevents snow and rain infiltration 
Discreet look 
Innovative seamless cap Ideal to replace goosenecks
Designed to replace traditional existing round  base ventilators 
three openings provide superior ventilation 
Innovative design prevents snow and rain infiltration 
Discreet look 
Innovative seamless cap
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In order to prevent deterioration of your roof, Venmar offers a highly efficiant and reliable time tested collection of solutions. Several models are available toaccomodate the many styles of home designs. Their base allows for a quick and easy installation.

  Available in 3 
popular colours. 

VENTILATION - Ventilators for sloped roofs - Made by Ventilation Maximum


# 301 Can ventilate
an area of 1000 to
1200 s.f. of building
# 302 Can ventilate
an area of 400 to
500 s.f. of building
# 303 Can ventilate
an area of 700 to
800 s.f. of building.
# 401 Turbine
Replacement


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To verify before starting : 
We recommend that you verify the following points before installing your ventilator so as to insure proper
functionning of the ventilation system :

• The soffits must be unobstructed by insulation and fully open; 
• Attic insulation to have R-30 rating; 
• The attic trapdoor must be well insulated; 
• Insulate all heating ducts located in the attic; 
• Exhaust vents must not discharge air into the attic; 
• All attic openings other than Maximum ventilators and soffits, must be completely closed. 
 

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VENTILATOR MODEL # 301 
Le modèle # 301-12 The model #301 has an average tested evacuation flow (made by an independant laboratory) of 418 CFM for a relative wind of 4 MPH. It can be used to ventilate a regular roof area of 1000 to 1200 square feet given that the points which must be verified before starting, have been examined.
This model is adaptable to roofs with slopes varying between 1/12 to 6/12. An adjustable extension piece or
special roof flashing is available for slopes exceeding 6/12. 
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Standard colors : brown, black and grey.

Special colors are available by special orders only and at a slightly extra cost.
Other dimensions available through special orders. 

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VENTILATOR MODEL # 302
The model # 302-12 has an average tested evacuation flow, made by an independant laboratory of 134 CFM for
a relative wind of 4 MPH. It could be used to ventilate a regular roof area of 400 to 500 square feet given that the
points which must be verified before starting, have been examined. 

Standard colors : brown, black and grey. 

Special colors are available by special orders only and at a slightly extra cost. Other dimensions available through special orders.

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VENTILATOR MODEL # 303
The model #303 has an average tested evacuation flow, made by an independant laboratory of 266 CFM for a relative wind of 4 MPH. It can be used to ventilate a regular roof area of 700 to 800 square feet given that the points which must be verified before starting, have been examined. 

Standard colors : brown, black and grey. 

Special colors are available on special orders only and at a slightly extra cost . 

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VENTILATOR MODEL # 401
Exchangeable head designed to replace faulty, round flashing ventilators, without modifying the existing system. Available with an adaptor ajustable to any twelve (12``) inch round flashing.

Installation on a 10 or 14 inch round flashing can be done through the use of a special adaptor of 10`` to 12`` or 12 `` to 14``.

Standard colors : brown, black or grey. 
Special colors are available by special orders only and at a slightly extra cost.
Replacement of a turbine by a model # 401
 


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MAXIMUM ROOF OUTLET DAMPER

The Maximum roof outlet damper can be connected to the exhaust outlet of any clothes dryer, bathroom ventilator or kitchen range hood which discharges from the roof . 

A metal deflector at the damper`s aperture diverts warm air and humidity to avoid possible ice build-up and water infiltration from melting snow. 
 

Product Code Description of the outlet
CT-4 Vent. Trap with a 4`` dia. pipe.
CT-6 Vent. Trap with a 6`` dia. pipe.
CT-10 Vent. Trap with a 3 ¼ x 10`` pipe.
Features : 
• Galvanized steel construction 
• Interior and exterior baked paint finish 
• Equipped with a connecting plenum to
   prevent humidity from escaping into the attic, 
   with choice of sizes as required :
   4 inch, 6 inch or 3 ¼ x 10 inch. 
• Removable protective grill keeps out birds
  and animals 
• Adapts to all sloped roofs 
• Storm proof 
• Available colours : brown, black or grey 
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SLOPED ROOF/SOFFITS BLOCKED BY INSULATION

It is extremely important for the soffits to be totally unobstructed in order to allow the exterior air to pass freely. The combination of soffits and the appropriate Maximum ventilator, strategically placed, provides a chimney effect that uniformly sweeps the attic to eliminate all heat build-up or humidity. If the soffits are blocked by insulation or any other material, use a styrovent to clear them out in order to have adequate attic ventilation.

SLOPED ROOF/SOFFITS BLOCKED BY WALLS

In the case of walls reaching the roof itself, which blocks all possible ventilation form the soffits, Ventilation Maximum recommends the use of fresh air intakes or special ventilators known as VMAXAT1 or VMAXAT2, uniformly positioned at the eaves. This will allow exterior air to enter into the attic and to circulate evenly; the peak ventilator then draws and exhauts all excess heat and humidity.
 

ROOF EQUIPPED WITH OPENINGS OTHER THAN SOFFITS AND VENTILATOR 

It is very important to seal all openings that would allow air to enter elsewhere than through the soffits.

If this is neglected, these openings located at the rafter level will inhibit ideal air circulation, which starts at the bottom and rises. The air that comes in through these openings will be drawn up by the ventilator, limiting air circulation to the rafter area only.

ROOF EQUIPPED WITH ROOF LOUVRE VENTILATORS

Roof louvre ventilators do not produce a chimney effect. Their effectiveness is limited to evaporation. 

They also present a definite risk for snow or water seepage. Above all, as soon as snow accumulates and covers them, they become useless especially when they are needed the most. 

The effectiveness of one Maximum ventilator is greatly superior to that of four roof louvre ventilators, with no risk of becoming ineffective because of snow accumulation or penetration.

SLOPED ROOF WITH LIMITED ATTIC HEIGHT

Ambient temperature and humidity rise rapidly in any attic with a limited air space.

The solution is to increase ventilation, making sure that there are no openings other than the soffits and the Maximum ventilators installed at the gable using a rooftop flashing, or on the rear slope of the roof.

ROOF WITH DORMERS

Dormer windows, being located at the soffit level, reduce the air intake because of the loss of soffit space. 

In this case, Ventilation Maximum recommends the installation of a special product : our stormproof ventilation louvres which do not allow snow to enter and ensure an air intake far superior to that of the standard soffit, enabling adequate ventilation to this problem area. It is also preferable to install the ventilators on the side of the roof opposite the dormers.

ROOF WITH ASYMMETRIC SLOPES

The soffit on the side of the shortest slope be 50% blocked, leaving the soffit of the opposite slope completely open. 

This balances the chimney effect and makes ventilation more efficient due to the joint action of the soffits and the Maximum ventilator. 

Drawn air enters and circulates evenly; the ventilator then uniformly exhausts excess humidity and heat from both sides of the roof.

MANSARD ROOF LACKING ADEQUATE AERATION

Inadequate aeration through the soffit may be caused by a piece of wood or brick at the junction of the mansard and the roof which is blocking air passage. Ventilation Maximum recommends using its special products installed near the eaves of the roof; fresh air intakes or special ventilators VMAXAT1 or VMAXAT2. 

CONVENTIONAL ROOF WITH TURBINE PROBLEMS

Is your turbine causing problems? 
It`s noisy, stop operating in freezing rain, and lets in water and snow! 

Here`s the solution : Ventilation Maximum manufactures replacement heads to exchange those noisy and defective models. A very simple installation is required : 
Remove a few screws from the existing turbine. Remove the old turbine and, Install a Maximum ventilator #40 
Our adapters make our #401 model easy to install. The old turbine can be replaced whether it is 10, 12 or 14 inches in diameter, leaving in its place a ventilator that is quiet, efficient, reliable and safe.
 

ROOF WITH WARM AIR VENT IN THE ATTIC OR NEAR A SOFFIT

With the presence of warm air vent discharge in the attic or close to a soffit, heat is drawn in the attic forming condensation which causes serious damage to the roof and insulation. 

To correct this problem, Ventilation Maximum recommends the installation of an additional ventilation duct with a roofcap to direct the flow of warm air outside away from the roof and at a suitable distance from the soffits. This prevents the possibility of hot air melting the surrounding snow which could cause an accumulation of ice.

GABLE ROOF HAVING ONE CATHEDRAL CEILING

Since the side with the cathedral ceiling is more difficult to ventilate, leave the soffit 100% open on this side and install Maximum ventilators on the non-cathedral side in order to force the flow of air to its direction. 

Partially obstructing the soffit on the non-cathedral side produces a balanced attic ventilation. 

This type of building requires installing a Maximum ventilator for every 600 square feet of insulated ceiling. 

SINGLE-SLOPED CATHEDRAL ROOF

Block the uppermost soffit and leave the lower one completely open, then ventilate at the gable of the roof to create a chimney effect. 

As the air volume in this type of attic is minimal, adding a second Maximum Type B ventilator to the cathedral ducting system doubles the ventilation capacity. 

There should be no other opening aside from the lower soffit and the Maximum ventilators.The lowest ventilator louvre must always be at least 6 inches above the highest point of the roof.
 

CATHEDRAL ROOF WITH TRUSSES

A cathedral roof trusses results in a limited attic height of 12 to 16 inches. The Maximum ventilator must be installed at the gable of the roof with a two-sided ridge flashing. 

It is necessery to keep soffits unobstructed and to ventilate from the roof 's peak to maintain even air circulation.

Install a Maximum ventilator model #301 for every 600 square feet of insulated ceiling.

THE SOLUTION TO CATHEDRAL ROOF PROBLEMS

For cathedral roofs the Maximum ventilator is absolutely essential. Given its superior drawing capacity it evacuates a large amount of hot, humid air. In addition, because of its height, you can always be assured of this efficient performance as it will never become covered by snow. 

An insulated air duct is therefore installed along the whole length of the roof`s gable. This will ensure sufficient ventilation between each roof joist. Air is drawn in through the soffits between each joist and is consequently evacuated by the Maximum ventilators.

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Roof ventilation to avoid water problems and condensation

Montreal Roofer Toiture-O-Sec offers Ventilation Maximum as the solution for your roofing ventilation needs.

Montreal Roofer Toiture-O-Sec offers Ventilation Maximum as the solution for your residential and commercial roofing ventilation needs

Roofing specialist for your roof replacement and repair needs / Our roofers are insured and certified
We provide a full range of services including a great selection of roofing tiles brands and colour choices. Whether you need a repair for soffit, roof ventilation, a strange leak around your roof skylight or ceiling windows or need of replacement of your roof shingles. 

ATCQ: A04-51072, RBQ:8302-8696-32, 4224, 4225, 4226(01), 4226(02) 

SPECIALIZED IN ROOFING TILES, ASPHALT,  CRUSHED STONE, TINPLATE INDUSTRY, FULLY INSURED FOR LIABILITY FOR RESIDENTIAL AND COMMERCIAL WORK

Premium quality producs such as; Mystique and Everest by BP and Cambridge by IKO.
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Montreal roofers - Toires O sec professional certified and insured roofing companyTravaux de toiture de qualitéWe provide quality work for your home roofing needs
Toitures, ventilation, soffit, couvertures de couvreurs certifiés pour travaux commercial et résidentiel dans la région de Montréal, Dorval, West-Island , Beaconsfield, Pincourt, Vaudreuil, Baie d'Urfe, Pointe-Claire, Lakeshore pour vos future projets. Réparation et installation neuves. Membre de la CESGMFrançais - Roofing, ventilation, roofers, Montreal, Dorval, West-Island , Beaconsfield, Pincourt, Vaudreuil, Baie d'Urfe, Pointe-Claire, Lakeshore for your future projects. Installation and repair.About us - Roofing, ventilation, Montreal, Dorval, West-Island , Beaconsfield, Pincourt, Vaudreuil, Baie d'Urfe, Pointe-Claire, Lakeshore for your future projects. Installation and repair.Privacy policy  - Roofing, ventilation, Montreal, Dorval, West-Island , Beaconsfield, Pincourt, Vaudreuil, Baie d'Urfe, Pointe-Claire, Lakeshore for your future projects. Installation and repair.
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Professional roofers for roofing shingle installation in the areas of Montreal, Pointe-Claire, Dorval, Dorion,
Beaconsfield, Baie d'urfe, Roxboro, Pierrefonds, Kirkland, Ste-Anne-de-Bellevue, Ile Perrot, Laval and more.