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Your store: Little Rock, AR.

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秒速赛车计划网

秒速赛车网

Q: What’s the difference between galvanized and prime painted steel deck?


Basic Components

Bare Steel + Zinc

Bare Steel + Prime Deck Paint


Standard Coating Thickness

G60 (0.6 oz/sf) or G90 (0.9 oz/sf)

0.3 mil dry film thickness single coat


Roof Deck Applications

Recommended for corrosive or high moisture environments within the finished structure. (Highly corrosive or chemical atmospheres may require stainless steel, which is available from D-MAC).

For roof deck applications, it is recommended for dry, non-corrosive interior environments in the finished structure.


Form Deck Applications

Standard for floor form deck applications.  The slab dead load may be deducted from the concrete design, as the permanent form will always carry this load.

May be used, but form must be designed as impermanent and therefore the slab dead load may not be deducted.


Composite Floor Deck Applications

Standard for composite floor deck applications.

Paint on the top side will interfere with shear bond and inhibit composite action.  Therefore, it should NOT be specified. Acceptable finishes include:  Bare steel top/painted bottom and galvanized top/galvanized and painted bottom.


Preparation For Field Painting

If bare galvanized steel decking must be field painted, ensure that any mill treatment is removed before priming.  Instead, D-MAC recommends ordering galvanized steel decking that is prime-painted in the factory when field paint over galvanized steel decking is required.

Apply field paint over a small area and test for adhesion before painting the entire area.


Field Painting

Field painting is possible, but deck must be cleaned and prepped extensively before the field primer and finish coats are applied. To save field labor and potential adhesion issues, D-MAC recommends ordering galvanized steel decking that is prime-painted in the factory when field paint over galvanized deck is required.

Field Painting is recommended, especially where deck is exposed during service.


Standard Appearance

Shiny silver

Dull grey top and bottom


Alternate Appearance

Shiny silver top, dull grey bottom

Dull grey top, flat white bottom


Intended Life-span

Permanent

Impermanent and provisional


Common Corrosion When Stored in Ordinary Atmospheric Conditions

Exposed edges and scratches are protected from corrosion by zinc, BUT “wet storage stain” or “white rust” will develop if water is trapped inside the deck bundles.

Exposed edges and scratches exhibit red rust. Water that flows into the bundle will create rust stains inside the bundles. Spray painting ends and edges upon receipt may reduce rust staining.


Jobsite Storage Recommendations

Deck bundles should be stored off of the ground with one end elevated to provide drainage and covered with a well-ventilated waterproofing covering.

See recommendation for Galvanized deck.


Cost

More costly

The most economical steel deck finish


Weight

>About 8% heavier than prime painted

About 7% lighter than galvanized


ASTM Specifications

A653/A653M

A1008/A1008M