GB keel, ordinary dragon brand gypsum board 9.5mm
In contrast, the cost of light steel keel is higher.
An ordinary gypsum board price is also about 20 dollars - up to no more than 25 dollars, per square meter (single layer) 6 to 8 dollars look. And a vice keel will be more than ten dollars, plus expansion screws, hanging tendons, the main keel, the cost will be gypsum board 2 to 3 times (or more).
Of course, the surface is high
