Storage of Color steel sheet On Site

Color steel sheet shall normally be delivered to the jobsite as required for erection, but if site storage becomes necessary, suitable storage areas shall be provided by the general contractor as close to the building site as is practicable. Preferably this storage shall be under cover. So, what should you pay attention to when storing color steel sheet on site?

Outdoor storage of color steel sheet

When outdoor storage is unavoidable:

a) use good quality covers, other than plastic, loosely shrouded over stacks and firmly anchored to prevent wind blow-off.

b) tilt bundles for drainage;

c) ventilate bundles but do not allow the

entry of wind driven precipitation;

d) block bundles off ground for effective ventilation and drainage, e) block long bundles to prevent sagging;store away from materials that could contaminate the surface (eg. diesel oil.paint, grease) and away from site traffic.

Reasons for wet stains on color steel sheet

Moisture can cause wet staining of metallic coated and pre-finished material and usually occurs as a result of:

a) condensation from high humidity and/or temperature cycling;

b) wet transport conditions of color steel sheets

c) wind driven rain penetration (out door storage).

The usual progression from water staining is unsightly white staining on zinc coated sheet (dark grey on 55% aluminum-zinc alloy coated sheet), to red rust. On material where wet staining has occurred, it should be noted that, except for aesthetic considerations, a nominal amount of staining is not detrimental to the functioning of the product.