Half an
Always conclude an agreement with the contractor by which you determine, all its duties.
Give money, but on
If builders demand money for the purchase of materials, because they know better what and where to buy, you can give money, but on one condition - you will go to the purchase of building materials with them or offer another option - you will purchase all the necessary materials yourself.
Light metal profile
In the first case, you will need to build a wall frame is better from wooden bars, but you can use light metal profile.
Will be pleased
No matter what you choose: mineral -fiber or polyuretral stoves, you will be pleased with the ease and ease of fixing them on the walls and protective properties.