Frequent Asked Questions

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Here's an list of frequently asked questions that we hope you find helpfull

uPVC and your home  |  Condensation and humidity   |Maintenance tips


uPVC and Your Home   Back To Top

How do vinyl windows compare with wood or aluminum ones?
Vinyl windows compare very favorably to those of other building materials.
Energy Savings: Vinyl is a great insulator, making it a great choice for windows and patio doors.

Convenience: Vinyl is extremely durable and provides a finish that is virtually maintenance-free.

Durability: Millwood Industries vinyl windows and patio doors are backed by our lifetime warranty, which exceeds the warranties offered by most wood and aluminum window manufacturers. If you live by a costal area where salt is a concern, vinyl windows will withstand the elements far better than aluminium or wood. We can also use 100% stainless steel screws and hardware as an option for those with this concern as well.

Appearance: A broad selection of window styles and sizes virtually assures that you'll find a window to enhance the look of your home. More importantly, unlike wood or aluminium vinyl windows don't rot, corrode, flake or peel therefore never need to be painted. Their appearance is easily maintained with periodic cleaning.


What is uPVC?
“uPVC” is short for unplasticized polyvinyl chloride, a type of vinyl. Vinyl itself is made from petroleum and salt, and it’s recyclable.


How will uPVC windows and doors affect my home’s air quality?
Surprisingly, uPVC can actually make indoor air quality better over the long run. How? With its smooth easy-to-clean surface, allergy-causing materials such as dust and pet fur don’t get a chance to become ground in. Plus the surface resists build-up from common household pollutants. Hospitals and other healthcare institutions often choose uPVC or vinyl for flooring, wallcovering and upholstery fabrics for these exact reasons.


How do I reduce street and traffic noise coming through my windows and patio doors ?
There are several ways to reduce noise. First, you’ll want to pick a uPVC window or door with a multichamber profile design. Why? Because air space helps reduce sound transmission, and multichamber profiles have more air space to deaden sound.

Second, look for the best weatherstripping you can afford. By ensuring that doors and windows close properly and prevent air leakage, triple-contact weatherstripping can virtually eliminate outside noise.

Third, consider thicker glass (6 mm or more) or laminated glass. Most of the surface area of a window or patio door is glass, and glass vibrates (and therefore transmits sound) just like the speaker in your stereo. Thicker glass tends to vibrate less.


Condensation and Humidity   Back To Top

Why is there condensation on the inside of my glass?
Condensation occurs when there is excess humidity in your home, especially when it’s cold outside. In actual fact, windows and doors don’t cause condensation, but they can tell you when the humidity level in your home is too high. Signs of condensation include:
  • Frost on door handles and hinges
  • Water or ice on windows
  • Damp spots or mildew on walls and ceilings
  • Moisture on cold water pipes, walls, and floors

Here are recommended humidity levels for a home set at 70°F/21°C:

Outdoor Temperature

Indoor Humidity

20 to 40 F
-5 to 4 C

Not over 40%

10 to 20 F
-11 to -6 C

Not over 35%

0 to 10 F
-16 to -12 C

Not over 30%

-10 to 0 F
-22 to -17 C

Not over 25%

-20 to –10 F
-28 to -23 C

Not over 20%

-20 C or below
-28 C or below

Not over 15%


How can I reduce the humidity level inside my home?
If you have humidifier, try turning it off or using it less frequently. Another option: open a door or window for ventilation, or install exhaust fans in the kitchen, bathrooms, and laundry room. Awning and casement windows are ideal for kitchens and bathrooms—places that get warm and humid easily.


What should I do about fogging or condensation between panes of glass?

Panes come factory-sealed, so fogging signals a problem with the seal, not air leakage or humidity. Contact your window and door retailer for help.



Maintenance Tips   

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The sash on my casement window is stuck. What should I do?
First, check the sash lock mechanism to make sure it’s completely unlocked. Then turn the handle slightly and push very gently on the sash near the lock mechanism. The sash should pop open. Open the window, and check the surface of the weatherstripping. You may want to apply a thin coat of dry lubricant to prevent sticking.



My hung or slider window isn’t opening as smoothly as before.
What should I do?

Check to see that the operating sash guide is clean. Over time, dirt and debris can settle in the guide, making it difficult to open and close the sash. Try cleaning with soapy water and a soft brush, then wipe with a clean, damp cloth to remove soap residue. You should avoid scrub pads and abrasive cleansers.
After the area is dry, applying a Teflon or silicon based lubricant to the area will help the sash operate smoothly; ask your window and door retailer for recommended brands.
If cleaning doesn’t do the trick, you may have a problem with the installation.



How do I clean uPVC windows and doors ?
You don’t need to do a lot of maintenance work on uPVC windows and doors: no painting, staining, or treatment. From time to time, just clean the interior and exterior frame with a standard soapy household cleaner diluted in water. And simply use a glass cleaner without ammonia for the glass.

Several of our casement models open a full 90 degrees for easy cleaning, while hung windows tilt in.



How do I open my casement windows a full 90 degrees?
Simply turn the crank until the window is open. You’ll be able to reach the outside surface for easy cleaning.



How do I tilt my hung windows for cleaning?
Open the bottom sash about three inches, then use both hands to open the tilt latches on both sides simultaneously. You’ll be able to reach the outside surface for easy cleaning.



What about cleaning my window and door hardware?
Wipe them down with mild soapy water, then wipe with fresh water to remove soap residue, which may prevent proper operation over time. You can also lubricate hinges with a dry Teflon or silicon based lubricant.

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