Repairing Loose Cast Iron Joints
- Procedure code:
- Outdoor Sculpture Manual - Cpb
- Ornamental Metal Castings
- Last Modified:
REPAIRING LOOSE CAST IRON JOINTS
A. This procedure provides guidance on inspecting,
tightening and repairing connections of cast iron
features that have become loose or are deteriorated.
NOTE: THIS PROCEDURE SHOULD BE PERFORMED ON AN AS NEEDED
BASIS BASED ON THE RESULTS OF SEMI-ANNUAL INSPECTIONS.
A. Nuts and bolts of appropriate sizes to match existing or
as required. Use AISI 316 stainless steel or bronze
connectors where possible.
B. Mineral spirits, naval jelly, etc. as required for
removing deteriorated paint and corrosion. For guidance
on paint removal from wrought iron, cast iron and steel,
see 05010-05-R, 05010-16-R and 05010-17-R.
C. Sandpaper and/or steel wool as required to remove
D. Molten lead
E. New cast or wrought iron, etc. for welded repairs.
F. High quality, paintable caulk
A. Wrenches, pliers, screwdrivers
B. Welding equipment
C. Stiff bristle brush
3.01 ERECTION, INSTALLATION, APPLICATION
A. Simple loose connections:
1. Locate loose joints and bolts, nuts and screws,
2. Carefully remove loose connectors and clean them of
all corrosion and loose debris using sandpaper,
steel wool, or a stiff bristle brush. Clean holes
and surfaces of feature as well.
3. Reinstall connectors in original location and
tighten connections which are functional.
B. Deteriorated connections requiring replacement
1. Remove connectors which are severely deteriorated
and frozen, for replacement with new.
2. Determine the number and size of required new
3. Clean holes and surfaces of feature of all rust and
4. If hole has corroded, redrill as required to
standard bolt or screw size.
5. Insert new stainless steel or bronze connector as
required to secure connection.
C. Wobbly newel posts or similar features:
1. If entire assembly is wobbly, carefully dismantle
feature. Mark pieces as required in inconspicuous
spot for easy reassembly.
2. Inspect center threaded rod or anchor pin(s) and
remove from setting hole in base.
3. Clean base of rod or pin of all corrosion and loose
paint. Blow-out hole with air blast to clean out
4. Repaint base of rod or pin as required before
placing it back into setting hole and packing hole
with molten lead.
5. Backprime all pieces of feature and reassemble.
6. If required to restore and/or improve stability of
newel, weld small wrought or cast iron tabs at base
of newel (two tabs per face).
7. Thread small stainless steel or bronze screws or
bolts through tabs into masonry base and fill holes
with molten lead.
D. Seal all seams with high quality, paintable caulk. DO
NOT USE CONCRETE TO FILL ANY VOIDS. DO NOT SEAL WEEP
HOLES OR DRAINAGE HOLES.
E. Paint feature as required. For guidance on painting cast
iron see 05010-13-S and 09900-07-S.