Page 27 - scvhs_mitchelladobereconstructionplans

RECOMMENDATIONS FOR MITCHELL ABODE SCHOOL

BY: Pamela J, Helvey (.li 3~ ~3b-01'f 8 May 26, 1987

RESTORATION; WADDLE AND DUBB TECHNIQUE
CONSTRUCTION METHOD; LABOR & MATERIAL NEEDS
Use of organic materials: straw, sand & mud
Use of old, unstabilized {no cement added) adobe bricks
Use of sand & mud morter
Use of fine grained sand & mud plaster applied by hand
Use of ceraffiic roof tiles
No reinforcement of load bearing walls
PERIODIC MAINTENANCE: FREQUENT
Re-application of exterior fine grained sand & mud ·plait~r
Re-application of roof tile celllent · · ,.·. · ·
Pest control extermination

~ECONSTRUCTION: STASLIZED BRICK AND GUNITE PLASTER TE£HNJQUE
CONSTRUCTION MtTHOO: LASOR t MATERIA~ N~~DS . ~
Use of modern material~: t?nc,~te, ~teet • £tMfR~
Use of concrtte floor baie · · ·
Use of steel reinforcement of load bearing walls
Use of new, stabilized .(cement added) adobe brick!
Use of gunite morter
Use of gunite or cement plaster applied by ceMent plaster ;un
Use of ceramic roof · tiles or tin roofing rnat~ri,~

PERIODIC MAINTEMANCE: INFREQUENT
Re-application of gunite or cement plaster
Pest control extermination

PRESERVATION: VSING SIMILAR MATERIALS (All ORGANIC OR ALL NON-ORGANIC>
STRUCTURE INSTABILITY DUE TO MIXTURE OF DISSIMILAR M~TERIAL$;
Inconsistant reactions of organic & non-organic mater)als to
environmental exposure to temperature &.~oisture
Or§aRie Materials allew taP Aatural evap~rati~A ~, ~~a~~~
water & salts at base and in walls of structure
Non-organic materials do not allow for natural evaporation of
ground water & salts at base and in walls of structure
Structures with of old organic adobe bricks mixed with new
stabilized abode bricks and gunite plaster show signs of
structure "melting": adobe bricks turn to mud & leave a
honeycomb shell of gunite plaster
Old material deteriorate at different (faster) rate than new
materials
Different requirements of maintenance: frequent re-application
of Mud plaster after exposure to yearly ~et season &
pest c,:>ntrol