Warping MDF doors

[Janakai]

Hi,

I just made a fitted cupboard with sliding doors of 18mm MDF (about 600mm wide by 2300mm high) using a Henderson top hung double track. Everything looked very good but the middle one of the 3 doors is now warping. The MDF is still untreated though it will have several coats of sealer, primer, paint etc.

I think I have clearance to reverse the door to solve the immediate issue but is this a known problem with MDF? I thought the stuff was not supposed to warp. The middle of the door has moved about 10mm in less than a week. The room is a well ventilated bedroom with little or no moisture.

Thanks for your comments.

 

[splinter]

AllI can think of is that piece of MDF was damp in the middle and has now dried out.It might pay to lay the door flat on the floor bend upwards and put some weight on it ,even going as far as to putting a thin piece of wood between the door and the floor,top and bottom just to counteract any "springback" in the door