03:16PM | 11/25/01
Member Since: 11/17/01
4 lifetime posts
I am using Henry Universal Underlayment 547 to skim coat old floor tile. After drying it shows some cracking along some of the underlying tile seams. What is causing this? Is it a problem? What should I do about it? Re-coat? Thanks!

Jay J

03:43AM | 11/26/01
Member Since: 10/26/00
782 lifetime posts
Hi bclerico,

Among others, it could be the result of a 'light' mix or fast drying or too thick of a layer. To be safe, I'd first review your instructions, then ctc. the MFGR. for guidance. It's possible that water/moisture was 'absorbed' by the underlying substrate too, thus causing a light mix. Also, if the room/house is dry, it could have dried too fast. Also, if the room below is REALLY warm, that too, could affect the situation. Get all your 'ducks' lined up and ctc the MFGR.

My best to ya and hope this helps.

Jay J -Moderator

PS: They may advise a light sanding then a 2nd application ...

PPS: God Bless America!


11:49AM | 12/12/01
Member Since: 11/16/01
301 lifetime posts
Dear BC,
I had a lady call me with the problem that her new ceramic tile was cracking. Upon examination, I found that when I walked on the floor, it bounced. The contractor is now on the "blacklist". Go to the middle of your floor and jump once. If you feel vibration, you may need to shore up your floor underneath. You may also have a cracked joist. Any diffriation or movement will crack underlayment. It is not concrete, only a leveling filler.
Good luck, Len
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