View Full Version : OT: Insulated double pane glass in patio door cracked

02-08-2016, 10:02 PM
A couple days ago I noticed that the outside pane of double insulated glass in the sliding part of my 60" x 80" sliding patio door had cracked, although the glass is still in place. I don't recall any specific incident that might have caused this, but we did have some high winds during our recent blizzard and tree limbs often fall during such events. There is also a very persistent Cardinal (avian, not Roman Catholic) who sometimes bonks his beak on the windows. But this is an inexpensive Home Depot door that was probably less than $300 and replacement movable door sections are in stock for $125, so I'm not complaining. I will wait until warmer weather and I'll probably get some help replacing it. I installed the door myself about 10 years ago, and my back is in worse condition now. Here are pictures:





At first I thought it was ice crystals, but it's definitely cracked glass. I think it is safety glass, although some pieces seem like they might be sharp.

02-08-2016, 10:11 PM
You installed the door 10 years ago and still have the efficiency sticker on it?

Me too, but I gave up after about 5 and took it off.

02-08-2016, 10:12 PM
Call around to your local glass shops. Odds are they can replace the insulated glass panel in about 20 minutes once they have it in stock. Done it many times on my rental property. Also the most cost effective answer.


02-08-2016, 10:16 PM
Stress crack, something was touching the glass when it was built, then colt, hot, high winds caused it to shatter. Normally sooner than this. Can you just replace the glass? Much cheaper & usually easier then everything still matches.

02-08-2016, 10:40 PM
Ouch. Luckily it's a quick easy change, they're normally built to standard sizes, so replacement will be easy. Put down some tarps, because as soon as you start moving it around those chunks are going to come out.

02-08-2016, 10:54 PM
Good homeowners' insurance policy should cover cost, unless you've got a too high deductible. Be sure to ask if/what any increase in next years' premium might increase to.

02-09-2016, 04:26 AM
I don't have homeowner's insurance. My house is still technically under construction. $125 to fix it after ten years is no biggie. Most of my neighbors in my area are getting free replacement roofs and siding because of hail damage from that "Hail of a storm" we had last June. That might have started a crack that finally "exploded" into what I have now. Fortunately most of the glass is still intact and relatively airtight. Otherwise I'd need to use a piece of plywood until warm weather arrives.

02-09-2016, 07:18 AM
I doubt the cardinal was responsible. I have birds fly into my windows quite often, even been standing there when they do. Never had one break the glass.

02-09-2016, 10:06 AM
I agree with the likelihood of a stress crack. I have awning windows in a room where nothing can get to them to damage them yet I have had several glass panes (8 to 10) crack and had to replace them. My panes are only single, not insulated, and not tempered, but stress caused the damage. The window frames in my case are aluminum and the glass panes were fit too tightly to the openings. When it gets cold and the frames contract the glass has pressure applied at points where it touches the frame and cracks, usually across a corner. The emplacement panes have been sized slightly smaller and I've had no recurrences in those windows.
All it takes is a pressure point, a lump or small protrusion in a frame that is a little too tight for the glass panel and temperature changes can cause pressure to be increased at that point causing breakage.
The glass in doors is generally tempered glass, by code, because of the greater possibility of it being kicked or damaged by a door swinging out of control. Tempered glass is tougher than plate glass, more resistant to impacts and when it does brake it doesn't break into large shards like plate glass but into small pieces as seen in your case. The side and rear glass in your vehicle are tempered glass, the windshield is safety glass which is laminated with a piece of plastic material as the center layer which keeps broken pieces, although they may be large, together.

During my tenure as a Firefighter we had many vehicle extrications to perform. Removing the glass from side and rear windows was simply accomplished with a sharp impact to a small area, usually with an automatic center punch which shattered the glass into small pieces. Windshield removal, on the other hand, was usually accomplished with an ax by chopping around the edges of the frame or using a reciprocating saw after punching a small hole. That glass, broken but still in one piece due to it's plastic core laminated construction, was then folded and placed under the vehicle to prevent slipping on it.

02-09-2016, 04:40 PM
You installed the door 10 years ago and still have the efficiency sticker on it?

Ha Ha! Good eyes!

And the response is: ??? :)

02-09-2016, 05:11 PM
Those Cardinals sure are pesky critters. I have one now living in a cedar tree that constantly attacks it's reflection in my windows and especially my car's mirrors. They can do a lot of damage to glass by scratching it and worse yet they come back year after year.

My Dad had a sliding door crack like that years ago, conveniently while I was looking out of it from across the room. Nothing hit it at the time. His insurance paid for it and the installer said that it happens more often than you would think.

02-09-2016, 05:18 PM
I doubt the cardinal was responsible. I have birds fly into my windows quite often, even been standing there when they do. Never had one break the glass.

There is a Cardinal glass company.

02-09-2016, 07:24 PM
http://bbs.homeshopmachinist.net/images/misc/quote_icon.png Originally Posted by Boostinjdm http://bbs.homeshopmachinist.net/images/buttons/viewpost-right.png (http://bbs.homeshopmachinist.net/showthread.php?p=1030515#post1030515)
You installed the door 10 years ago and still have the efficiency sticker on it?

Ha Ha! Good eyes!

And the response is: ??? :)

Yes. I thought it was illegal to remove those tags, like the ones on mattresses. :rolleyes: