SPECIFICATIONS FOR STEEL HIGHWAY BRIDGES. 17 
FIELD PAINTING. 
When the erection work is complete, including all ij^f/ ^'^^^ ''^^^^" 
riveting, straightening of bent metal, etc., all adhering 
rust, scale, dirt, grease or other foreign matter shall be 
removed as specified under Shop Cleaning. 
As soon as the field cleaning is done to the satisfaction j^^^. Field paint- 
of the engineer the heads of field rivets and bolts and any 
surfaces from which the shop coat of paint has been worn 
off or has become otherwise defective and all shipping 
and erection marks shall be thoroughly covered with one 
coat of the same paint as used in the shop and permitted 
to become thoroughly dry before the first field coat is 
applied. 
When the paint applied for ^Houching up" rivet heads 
and abraded surfaces has become thoroughly dry the first 
and second field coats may be applied. In no case shall 
a succeechng coat be applied until the previous coat has 
dried throughout the full thickness of the paint film. 
ill! small cracks and cavities which have not been 
sealed in a watertight manner by the first field coat shall 
be filled with a pasty mixture of red lead and linseed oil 
before the second field coat is applied. 
MAINTENANCE PAINTING. 
Unless otherwise provided, maintenance painting shall i4. scope of 
consist of the removal of the rust, scale, dead paint, dirt, 
grease or other foreign matter from the metal parts or 
portions of existing bridge structures and the application 
of paint thereto. 
All metal surfaces not in close contact with other metal 
surfaces or with wooden floor or truss members, concrete, 
stone masonry, etc. shall be considered as exposed to 
deterioration by rusting and shall be thoroughly cleaned 
and painted the number of coats indicated in and made a 
part of the contract. 
Unless otherwise provided, metal after being cleaned to ^^^^^ Number of 
the satisfaction of the engineer shall be painted at least 
two coats of paint. 
The requirements and methods of procedure for niain-^^^p^iiting/"^ 
tenance cleaning and painting shall be the same as speci- 
fied for shop and field painting. 
Whenever roadway or sidewalk planking is laid too 
closely in contact with the metal to peniiit free access for 
proper cleaning and painting, the planks shall either be 
removed or cut to provide at least a 1-inch clearance for 
that purpose. The removal or the cutting of planks 
shall be done as directed by the engineer. All planks 
removed shall be satisfactorily replaced and if broken or 
otherwise injured to an extent rendering them unfit for 
use they shall be renewed at the expense of the con- 
tractor. 
90578°— 24t 3 
