Is there a specification for gypsum board ceilings to leave expansion joints?

To leave the expansion joint, according to the actual site environment to decide how big to stay, generally between 2mm-8mm, the greater the change of cold and heat, the greater the stay. If it is a keel made of wood, it needs to leave a larger reserved joint (expansion joint) than the light steel keel, and the specification is generally drawn up by Party A, and there is no national standard, because the temperature and humidity vary greatly from place to place.

Conditions for making expansion joints:

If the unilateral distance of the gypsum board ceiling exceeds 12 meters, expansion joints should be set. The double-layer gypsum board ceiling needs to leave 10-20mm seams, the handover length is 30-50mm, and the spacing from the edge of the expansion joint to the suspension bar is not more than 300mm. The single-layer gypsum board ceiling is lined with blockboard (fireproof treatment) and connected with the side keel, and the lower mouth is left with a 10-20mm seam.

The width of the wall is more than 12m, the left and right sides of the wall panel and the three sides above, and the four sides of the southeast, northwest and northwest of the ceiling, and the expansion joints should be left, which need to be closed by elastic sealing paste or installed with decorative strips.

How to make an expansion joint:

Fix one side of the vertical keel, and nail one, two or three layers of 12mm (or 15mm) paper gypsum board on the vertical keel, and then install the other side of the vertical keel back to back at a distance of 10mm; Along the position of the expansion joint, the gap left is to install the gypsum board on both sides of the wall; Cut a stretch joint fitting equal to the length of the control joint, and use quick-drying adhesive or self-tapping screws respectively according to the different varieties of expansion joint accessories, and fix the expansion joint accessories at the expansion joint of Shanghai Yibor gypsum board on the paper surface; joint treatment with caulking plaster; Pull out the rubber strip from the expansion joint fitting.

07CJ03-1 Atlas: When the length of the ceiling is greater than or equal to 12m or when the expansion joint of the building structure is encountered, the expansion joint must be set.

Of course, you have to stay, or you won't crack when you change between hot and cold

According to the actual site environment to decide how big to stay, generally between 2mm-8mm, the greater the change in cold and heat, the greater the stay.

If it is a keel made of wood, it needs to leave a larger reserved joint (expansion joint) than the light steel keel, and the specification is generally drawn up by Party A, and there is no national standard, because the temperature and humidity vary greatly from place to place.

There is no other thing to stay. Gypsum board does not expand and contract at all. Stop misleading people who don't know.

The gypsum board ceiling must leave expansion joints, otherwise according to the principle of "thermal expansion and cold contraction", the gypsum board ceiling will crack.

1. How much to keep should be decided according to the actual site environment, generally between 2mm-8mm, the greater the change in cold and heat, the greater the stay;

2. If it is a keel made of wood, it is necessary to leave a larger expansion joint than the light steel keel.

The atlas is generally drawn up by Party A, and there is no national standard, because the temperature and humidity vary greatly from place to place.