hairline cracks in walls inside and out of my home

What is the best concreate or mix to repair hairline cracks in my walls and how should i aproach it,so far no water was coming through these cracks.I was told to try some concrete mix that you just add water to and slap on....is this ok to try?

 

What type of a wall is cracking? drywall, concrete block, plaster?

 

Are the walls above grade or below grade?

How wide (hairline, 1/8", 1/4", etc.) are the cracks, where are they and what direction (horizontal, vertical, diagonal, stair-step?) do they generally run?

All of this can help to pinpoint the cause, importance and best mehod of repair. The more information, the better the answer.

If the cracks are not too wide and relatively old (inactive), then is may just be a cosmetic situation.

Dick

 

they are in my basement below ground level and go from floor to celieng,some go straight & some go left than right they are like as wide as a sharpie marker line.outside i have the same below my pourch.It is cinderblock

 

is it too cold to do crack repairs in 40-50 degree weather

 

For small cracks, you can use a high quality caulk. The tube will give the the directions on application relative to you temperatures.

If these are older, inactive cracks, use HYDRAULIC CEMENT - available at a big box. - Do not use portland cement that comes in a much larger bag. Enlarge the crack slightly and FORCE the hydraulic cement (follow directions) into the crack. The cement will expand slightly, filling and sealing the crack in a short period of time. Depending on the temperature it can be as little as 5 minutes, so you may wish to experiment in a hidden area first. The cement cures quite quickly.

Dick

 

some of my cracks are very thin in the cynderblock,should i just cover them w/the hydraulic cement?how is the correct way to mix it?

 

As I mentioned, use caulk for small cracks. Covering small cracks with hydraulic cment is not effective.

For larger cracks, enlarge them and FORCE the hydraulic mixed cement into the cracks. It will set quickly. The hydraulic cement package contains the mixing instructions.

Dick