Multi-chambered design reduces exterior noise, adds insulation and strength and provides thermal efficiency.
Multiple weather-stripping provides outstanding protection against the elements.Up to 5 weatherstrips help reduce heating and cooling costs.
Screen channel designed for screen removal from inside your home.Half screen and full screen are available.
Welded frame and sash corners provide strength and protection against air and water infiltration.
Snap-in interior glazing bead allows easy replacement of glass from the inside
Double-walled sash design for superior strength.
Unique sloped sill on double hung evacuates the heaviest rains much like a wood window sill and keeps bugs out.
Provision to add windbreak to cut down on air infiltration.
Extra thick wall design for improved rigidity.
Provision to add windbreak to cut down on air infiltration.
Interior groove allows the addition of mouldings such as 3/4" wood and 1/2" drywall return or all u-PVC jamb extension.
Provision for installation brackets.
Tilt option available for easy cleaning
New Ostaco "inLighten" screen is available.
Core PLUS Double Hung/Sliders Performance Ratings
Series
CorePlus Double Hung
CorePlus Double Slider
Core Double Hung
Core Double Slider
Air Infiltration Resistance
A3
A3
A3
A3
Water Infiltration Resistance
B3
B4
B3*
B4
Wind Load Resistance
C4
C5
C3
C2
Forced Entry Resistance
F10
F10
F10
F10
Core Series and Core Plus Series windows are Energy Star approved. Performance chart by USWADA.
Core PLUS Double Slider & Double Hung Windows
The Double Hung and Single slider feature two operable sashes within a single frame. The advantage of the 4 9/16" frame is that it allows for a sloped sill on the hung windows which is not only aesthetically pleasing but also provides for superior drainage.
Frame
4 9/16" frame
Wood Extension Options
Available with a wide variety of wood extensions from pine to oak.
Colour
White, Ostaco Tan, or exterior painted in your choice of colour.
Performance Rating
Energy Star approved.
Glass options
Standard Low E2;
our latest comfort technology LowE3;
or our new Low E 179c (the best ER rating in the entire world!).
Options
A wide range of decorative grilles and energy-smart glazing options are available to give your window a custom-designed look.
When I contacted a local dealer about windows for the house that we were building , he showed me a number of different types and suppliers. I wanted ...
Gerry Goreski
To Dundas Wood Windows:
Nelson, just wanted to write a quick thank you note to you and your team for the fine job you did with our new Ostaco ...
Robert (Rob) Ribarich
It was most appreciated and we are pleased to see such good service at Lambden
J. and B. Madden, Ottawa, ON
Your windows and doors came very highly recommended. My new house looks spectacular. I am glad I listened to the recommendations given to me.
Frank Chanady
We are very delighted and pleased with your excellent job and most impressed with the polite and professional staff...
Multi-chambered design reduces exterior noise, adds insulation and strength and provides thermal efficiency.
