Existing Customers

Existing Customer

  • What are my windows telling me?
    Your window can give you many signs when it is due for a maintenance. For a complete service & maintenance guide, please click here.

  • Experiencing condensation?
    There are several factors that put moisture into our home and cause our windows to build condensation. To learn more on condensation please click here.

  • Trouble Shooting Guide
    1) My locking latch won’t close.
    Sashes may not be all the way in the closed position.
    Try pushing the sashes in opposite directions with strength.2) My window won’t open so I can clean it.
    Sash latches may not be engaged at the same time.
    Try pushing the sashes in opposite directions with vigor.Night/vent latches may be in the open position.
    Close the night/vent latches by pushing them towards the sash frame so that they are flush with the window.There may be dirt built up in the track.
    Using a rag and solution of warm water and dish soap, revert the dirt built up.3) I am pushing the sash latches in, but I can’t pull the top of the inner sash towards me.
    The inner and outer sash may still be joined at the meeting rail.
    Before engaging the sash latches, open the inner sash approx. 1.5”. This will separate the sashes, unhooking the meeting rail.

    4) The inner and outer sash does not seem to be joining at the meeting rail.
    One of the sashes may not have been properly replaced after being removed.
    Follow the instructions to remove the sash. Ensure when placing the sash back in the track that the same pin is fitted into the shoe in the proper track.

    5) Condensation on Windows
    There are several factors as to why condensation builds up on the inside of windows. Reducing or eliminating condensation often means using several complementary techniques. These techniques concern the window itself, the method of installation, the interior window accessories (curtains, blinds, and valances), and the arrangement of heat sources (hot air registers, baseboard heating, convection heaters) and the relative humidity of the indoor air. The overall condensation resistance of a window depends on each of these factors.

  • How to care for your windows

    Single & Double Hung Windows

    Tilting the sash for cleaning
    DO NOT use solvents, such as lacquer thinner or acetone. Use of these solvents will affect the vinyl, as well as void your warranty.
    1)Unlock the sash lock and slide the bottom sash about 3 inches.
    2)Slide the tilt locks simultaneously towards the center.
    3)Grasping the top of the sash firmly, pull it in towards yourself. Pull gently until the sash is perpendicular to the wall. Rest the sash on a support or the window sill.
    In Double Hung windows, repeat the same procedure to open the outer sash.
    It is imperative to support the weight of the sash as it is swung. Failure to do so could cause damage to the window or harm you.

    Removing the Sash

    Follow above steps 1-3
    4)Firmly grasp the sides of the sash and pull up. Then towards you, lifting the sash pin out of the shoe.

    Replacing the Sash

    Tilt locks must be open to replace sash.
    1)Firmly grasp the sides of the sash and lift it perpendicular to the window frame and wall.
    2)Line up the sash pin with the track and push down firmly until the pin is re-inserted into the shoe.
    3)Rotate the window upward until almost parallel with frame.
    4)Push the top of the sash back into the sash track with strength, the sash latches will click when they are properly returned into the track.

    Casement Windows

    Remove screen prior to cleaning.
    1)Push the locking latch upwards into the open position.
    2)Extend crank handle.
    3)Turn handle counter clockwise until sash is extended.
    4)To close, crank clockwise. Pull locking latch back down.
    Cranking the sash flush with the frame while locking clip is in the down (closed) position can cause damage to the latching pins.

  • Care and Cleaning Dos and DONTS.
    Smooth Operation

    • DO lubricate the moving parts of window and door hardware, if not operating smoothly. Use only a spray silicone product to lubricate moving parts, being careful not to apply excessive amounts. Wipe up any drips or spills. In salt air environments, monthly cleaning and lubrication may be necessary to preserve function.
    • DO inspect weather stripping on operable windows and doors to be sure it seals evenly when closed.
    • DO make certain that the track area is kept clean. Frequent vacuuming will clear any accumulated dirt and dust.
    • DO adjust sliding door rollers for proper height clearances. Door rollers are adjusted with a screwdriver through access holes in either the end or side of the sliding panel, located near the bottom of the panel.
    • DO adjust rolling screen doors to slide smoothly. Use a screwdriver, in all four corners, to make adjustments.
    • DO check on the sliding door lock strike placement, if you adjust the door rollers. Adjustment is made by loosening screw fasteners, moving strike plate and tightening. Re-Check for proper lock operation.

    Windows and doors use a simple drainage system or use weep holes designed in the frame itself. These water drainage pathways must be kept clean and clear of any obstructions to operate effectively.

    Its normal for a water to accumulate in the sill or track area. The weep system is designed to allow the water to drain as water builds up, or outside wind pressure subsides. Clogged weep holes may prevent excess water from draining. Over time, this standing water can damage your window and lead to structural damage from mold, mildew and wood rot.

    • DO keep all sill a track surfaces clean or dirt and debris.
    • DO make sure that exterior weep holes are clear of any debris, stucco or other obstructions.
    • DO use a small, soft brush to clear openings.
    • DO regularly inspect the exterior perimeter of your window and door frames for any cracks, or cracks in the adjacent siding material that can cause moisture to penetrate. If a crack appears, use a good grade of sealant.

    Glass Care- Proper care of your window and door glass is important to gain the maximum effectiveness of insulating, low-e or reflective glass. Any of the DON’T actions listed below can damage the glass surface or destroy the insulating glass seal.

    • DO clean glass with a mild dish soap and water solution. Rinse completely with clean water and wipe dry with a soft cloth to avoid water spots.
    • DO avoid washing glass in direct sunlight, for best results.
    • DO clean screens by first removing, then washing on a clean, flat surface with a mild soap and water solution using a soft brush. Rinse, dry, and reinstall.
    • DON’T use a razor blade, abrasive pad or putty knife to clean the glass.
    • DON’T use any petroleum based cleaners or caustic chemicals on your glass.
    • DON’T use a high-pressure spray nozzle when rinsing your glass after washing.

Request Information



How long will the new windows and doors last?

They will last the lifetime of your home. With our hands down best in the business warranty we stand behind our promise to ensure you peace of mind. No fine print and fully transferable to... Read More

View All

We were satisfied with the installation work area was cleaned up and installers were friendly and knowledgable for the installation the only issue that we had was the finish causing on the outside... Read More

-John Leonard and Linda T
View All

Do You Need Gutter Protection?

We can’t control the weather, and when it rains heavily, it’s hard to control where the water goes. If the water gets into the wrong places, it can cause a lot of damage to our… Read More

View All


Click for the BBB Business Review of this Windows in Thorold ON
Sign up to receive special offers and promotions from Landmark

© 2018 Windows & Doors Installation Company - Landmarkquality.com. All Rights Reserved.