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White Chalky Film on SYP Tongue and Groove Ceiling

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Forum topic by OLCHIEF posted 04-02-2020 08:28 PM 420 views 0 times favorited 11 replies Add to Favorites Watch
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OLCHIEF

35 posts in 121 days


04-02-2020 08:28 PM

My house was built in 1986. The living room walls and vaulted ceiling are tongue and groove southern yellow pine with some type of clear finish. Over the past year I have noticed a white chalky film on the surface of the ceiling boards. It wipes off and feels like chalk dust. I am thinking the varnish they used is breaking down but I thought I would ask the experts here if you have seen this before.

-- OL CHIEF, Florida Panhandle


11 replies so far

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OLCHIEF

35 posts in 121 days


#1 posted 04-03-2020 05:36 PM

I must have a new discovery

-- OL CHIEF, Florida Panhandle

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ibewjon

1545 posts in 3533 days


#2 posted 04-03-2020 07:09 PM

Better get a patent guick, before an interior decorator spreads the idea!

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OLCHIEF

35 posts in 121 days


#3 posted 04-03-2020 09:54 PM



Better get a patent guick, before an interior decorator spreads the idea!

- ibewjon


If I could work a sliding barn door in there we could make a fortune!

-- OL CHIEF, Florida Panhandle

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CaptainKlutz

3041 posts in 2234 days


#4 posted 04-04-2020 12:49 AM

Possible causes:

1) Water spots: Dried condensation left behind minerals marking finish.

2) Damaged Finish: Mechanically abraded, or water soaking has created holes and edges of finish are white.

3) Mineral or Resin seeping out of the base lumber due water exposure.

Only close destructive examination will find #2-3. #1 can be found by applying heat and moisture to hydrate the minerals.

4) Need to have eyes checked for floaters, or maybe need new glasses. LOL

Best Luck. :-)

-- If it wasn't for bad luck, I wouldn't have no luck at all, - Albert King - Born Under a Bad Sign released 1967

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BlasterStumps

1644 posts in 1179 days


#5 posted 04-04-2020 02:19 AM

We run a small table-top humidifier and as a result get a light efflorescence coating noticeable on the windows that is similar to what you are describing.

-- "I build for function first, looks second. Most times I never get around to looks." - Mike, western Colorado

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GrantA

2431 posts in 2147 days


#6 posted 04-04-2020 02:25 AM

Chief have you been in the house since 86?
Has anything changed in the past year or so you’ve noticed this?
Did it seem to be a clear finish originally?

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OLCHIEF

35 posts in 121 days


#7 posted 04-04-2020 11:56 AM



Chief have you been in the house since 86?
Has anything changed in the past year or so you ve noticed this?
Did it seem to be a clear finish originally?

- GrantA


Yes we have been here many years. The only thing really different is last year we had hurricane mitigation retrofitting done where they used a closed cell foam adhesive to glue the bottom of the roof sheathing to the tops of the trusses but that should not have touched the top side of the T&G boards. We also had an exceptionally wet winter and I am wondering if that might play a role.

-- OL CHIEF, Florida Panhandle

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OLCHIEF

35 posts in 121 days


#8 posted 04-04-2020 11:57 AM


Chief have you been in the house since 86?
Has anything changed in the past year or so you ve noticed this?
Did it seem to be a clear finish originally?

- GrantA
And yes the finish was clear
Yes we have been here many years. The only thing really different is last year we had hurricane mitigation retrofitting done where they used a closed cell foam adhesive to glue the bottom of the roof sheathing to the tops of the trusses but that should not have touched the top side of the T&G boards. We also had an exceptionally wet winter and I am wondering if that might play a role.

- OLCHIEF


-- OL CHIEF, Florida Panhandle

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Heyoka

47 posts in 592 days


#9 posted 04-04-2020 12:37 PM

Better get it checked for mold!

-- Heyoka

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splintergroup

3681 posts in 1962 days


#10 posted 04-04-2020 02:43 PM

I installed 4” T&G pine on several ceilings in my house circa 2000. Pine with WB poly. No issues what-so-ever but this is the southwest and quite dry, though a swamp cooler runs in the summer (humid) and a pellet stove in the winter (dry).

I’d bet on moisture/condensation fi I had to make a guess. Can you wipe/scrub/scrape clean an area and see if it returns?

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OLCHIEF

35 posts in 121 days


#11 posted 04-04-2020 05:01 PM

We are mopping the ceiling with Murphy’s Oil Soap and also trying Liquid Gold to day. It is cleaning up ok.

-- OL CHIEF, Florida Panhandle

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