faulty ceiling
#1
12-24-06, 12:58 PM
faulty ceiling
My daughter had her tile, plaster lath bathroom remodeled. The ceiling in the shower is peeling and has brown spots. To the best of her recollection, they kept the plaster in some ares and used sheetrock in others. Shouldn't they have used blue/green board or cement board with the proper primer and top coat?
#2
12-25-06, 06:47 AM
Does the bath have an exhaust fan? If so is it be used?
It is fairly common practice to use drywall when repairing/replacing plaster - easier for non plasterers and less expensive. IMO green board isn't needed if the drywall is properly painted. The drywall should have been shimmed as needed so very little joint compound would be needed to bring it level with the existing plaster.
All exposed walls should have been primed [not always needed for already painted areas] and then top coated with 1-2 coats of latex enamel.
Was flat latex or latex enamel used for a finish? Is just the paint peeling or is the j/c also peeling? Are the brown spots exposed plaster base or could it be mildew? Mildew will wash off with bleach water.
When was the bath rm remodeled? Did the contractor offer any warranty?
It is fairly common practice to use drywall when repairing/replacing plaster - easier for non plasterers and less expensive. IMO green board isn't needed if the drywall is properly painted. The drywall should have been shimmed as needed so very little joint compound would be needed to bring it level with the existing plaster.
All exposed walls should have been primed [not always needed for already painted areas] and then top coated with 1-2 coats of latex enamel.
Was flat latex or latex enamel used for a finish? Is just the paint peeling or is the j/c also peeling? Are the brown spots exposed plaster base or could it be mildew? Mildew will wash off with bleach water.
When was the bath rm remodeled? Did the contractor offer any warranty?
#3
12-25-06, 09:01 AM
ceiling
Originally Posted by marksr
Does the bath have an exhaust fan? If so is it be used?
It is fairly common practice to use drywall when repairing/replacing plaster - easier for non plasterers and less expensive. IMO green board isn't needed if the drywall is properly painted. The drywall should have been shimmed as needed so very little joint compound would be needed to bring it level with the existing plaster.
All exposed walls should have been primed [not always needed for already painted areas] and then top coated with 1-2 coats of latex enamel.
Was flat latex or latex enamel used for a finish? Is just the paint peeling or is the j/c also peeling? Are the brown spots exposed plaster base or could it be mildew? Mildew will wash off with bleach water.
When was the bath rm remodeled? Did the contractor offer any warranty?
It is fairly common practice to use drywall when repairing/replacing plaster - easier for non plasterers and less expensive. IMO green board isn't needed if the drywall is properly painted. The drywall should have been shimmed as needed so very little joint compound would be needed to bring it level with the existing plaster.
All exposed walls should have been primed [not always needed for already painted areas] and then top coated with 1-2 coats of latex enamel.
Was flat latex or latex enamel used for a finish? Is just the paint peeling or is the j/c also peeling? Are the brown spots exposed plaster base or could it be mildew? Mildew will wash off with bleach water.
When was the bath rm remodeled? Did the contractor offer any warranty?
We don't know how the ceiling was prepared and painted - we also don't know about the brown spots but want to leave things for the contractor to see. We feel he will come back and do it right b/c my daughter's friends would use him or not depending upon his integrity. Th remodelin was just done last week and I think he did not prepare or paint properly.
Thank you for the advice.
#4
12-25-06, 09:36 AM
Member
Peeling paint may be due to moisture from tub/shower or poor surface prep for new paint or the wrong kind of paint over old or a combination of these factors.
Running bathroom vent/fan during and after bathing for about 20 minutes removes excess humidity. Having the correct size of vent/fan to have at least 8 air exchanges/hour is important. This will control the condensation from warm/moist air that condenses on shower ceiling.
To calculate the correct number of CFMs (cubic feet/minute) for adequate air exchange:
Calculate cubic feet of bathroom (length x width x height)
Divide by 60 (# minutes in an hour) (8 air exchanges/hour is recommended)
Multiply by 8 (for the 8 required exchanges)
This number will give you the number of CFMs required for the vent/fan.
Ceiling should have been properly cleaned for painting. Many use TSP (trisodium phospate) to clean. All loose paint should have been scraped off and surfaces sanded smooth before repainting and primed.
If latex paint was applied over oil paint, it will crack and peel. A test is to paint a small patch of latex over existing paint. When dry, if you can scratch if off with fingernail, the old paint was oil. If oil, then surface should be primed before painting with latex.
Running bathroom vent/fan during and after bathing for about 20 minutes removes excess humidity. Having the correct size of vent/fan to have at least 8 air exchanges/hour is important. This will control the condensation from warm/moist air that condenses on shower ceiling.
To calculate the correct number of CFMs (cubic feet/minute) for adequate air exchange:
Calculate cubic feet of bathroom (length x width x height)
Divide by 60 (# minutes in an hour) (8 air exchanges/hour is recommended)
Multiply by 8 (for the 8 required exchanges)
This number will give you the number of CFMs required for the vent/fan.
Ceiling should have been properly cleaned for painting. Many use TSP (trisodium phospate) to clean. All loose paint should have been scraped off and surfaces sanded smooth before repainting and primed.
If latex paint was applied over oil paint, it will crack and peel. A test is to paint a small patch of latex over existing paint. When dry, if you can scratch if off with fingernail, the old paint was oil. If oil, then surface should be primed before painting with latex.
Last edited by twelvepole; 12-25-06 at 11:41 AM.
