Hey all,I just bought my first house and have been doing a lot of home improvement projects. The house is a 1.5/2 story Cape Cod style home built in 1986. In one of the rooms, the ceiling was pillowing and had cracks forming at the drywall joints. The walls were generally ok, but needed minor fixes on nail pops, dings, etc.Problem: Immediately after I finished painting, hairline cracks started appearing in the ceiling. The cracks are only forming in the ceiling. Here is an image of the cracks - https://ift.tt/2lbl73h are the steps I took during the project:Used 2 1/4" coarse drywall screws to re-secure drywall to ceiling joists and wall studs.Hammered in nail pops.Stripped out tape and mud from failing drywall seams.Scraped large chunks of loose paint as needed (note - I did not strip entire walls and ceilings of all paint).Re-taped seams using mesh tap then applied layer of Plus 3 All-Purpose joint compound (link) over tape, and let dry ~24 hours.Applied second coat of Plus 3 All-Purpose joint compound (link) over tape, let dry ~24 hours, then sanded and wiped down with damp cloth.Primed using Zinsser B-I-N (link), let dry ~24 hours.Skim coated walls and ceilings using water-thinned Plus 3 All-Purpose joint compound (link), and let dry ~24 hours.Applied second skim coat and let dry ~24 hours.Sanded everything down using 220 grit paper.Wiped walls using dampened Swiffer Dry Cloth (link) (note - did not use the wet version with cleaning chemicals).Vacuumed and tried to decontaminate room to eliminate dust.Primed using Zinsser B-I-N (link), let dry ~24 hours.Painted ceiling using leftover (approximately 3 months old) Sherwin Williams Master Hide in flat finish (link) using Wooster Pro roller with 3/8" nap (link) (note -paint was cut using Floetrol (link) at a ratio of 4-6 oz. per gallon)Painted walls using new Behr Premium Plus in eggshell (link) using Purdy White Dove roller with 1/4" nap (link) (note -paint was cut using Floetrol (link) at a ratio of 4-6 oz. per gallon)Other NotesThe room is on the first floor of the house and beneath another bedroom, so I think that pretty much eliminates the possibility of there being any type of water leak. There were also never any signs of water damage.My best guess is that the drywall is original to the house (1986). Drywall appears to be 5/8" based on measurement at cutout for light fixture, but that wasn't a clean edge and I'm not 100% certain.When scraping paint, I noticed large chunks did come off relatively easily over the areas that had joint compound. The paint had better adhesion to the drywall itself and would start tearing at the paper a bit. To avoid tearing the paper as much as possible, I would score the paint at this point to try and create a clean break point.The above paint peeling situation and appearance of surface beneath paint leads me to believe the original drywall was likely a level 3 finish or maybe 4 finish that was either (a) not completely primed or (b) "primed" with an all-in-one paint/primer (if that was around in 1986).No cracks are forming in the walls, although some unsightly drips did appear (weren't there when I was rolling, not sure if that is because of using Floetrol).I live in the Southern US and it has been generally very hot and humid (85+ degrees, 80%+ humidity). Windows were left opened when applying the B-I-N primer.Help?!? Anybody have any ideas on where I went wrong? Any ideas on how to fix it? Nothing more frustrating than having hours of work be spoiled at the end! Thanks in advance for your time and help! via /r/DIY https://ift.tt/2lbt0Gb
