Arch&Civil Engineering: 2013

method of statement for plastering

Summary: This method of statement for plastering includes the following;

• Internal Portland cement plaster:

• External Portland Cement plaster:

• Formed in Place plaster grooves in elevation:

• External Formed in place decorative cornices in building elevation

Materials for Application;

1. Portland Cement ASTM C150 Type

2. Sand Aggregate ASTM C 897 White Sand for base coat, red sand for dash coat.

3. Plastering Accessories: Metal Lath, angle beads, special pieces for internal angles and corner.

4. Fiber

5. Trial Mix

6. Details for Metal Lath Location and Installation (Typical) (Submission for Approval) (Trans.# C-0260).

1. Preparation

A. Clean the surface and remove any dust, contaminated materials on plaster bases and substrates for direct application of plaster, removing loose material and substances that may impair the work. Form ties and other obstruction shall be removed or trimmed back even with the surface of the solid base.

B. Dissimilar Backgrounds: where rendering is to be continued without break across joints between dissimilar solid backgrounds which are in the same plane, cover joints with 200mm wide galvanized steel lathing as specified & approved fixed with corrosion resistant fasteners at not more than 600mm centers along both edges, apply mesh over electro-mechanical embedded conduits.

C. Apply forcefully dash coat on concrete and concrete masonry surfaces indicated for direct plaster application. Dash coat is to cover full surface to be plastered and is to provide rough surface of sharp protrusions ranging 3.0mm and 5.0mm. Dash-Coat Mix: 2 volume parts Portland cement to 3 volume parts fine sand, 1 part bonding agent to 3 part clean water mixed to a mushy-paste consistency shall be left untroweled, undisturbed and moist cured for at least 24 hours after application and before plastering.

D. Install temporary grounds and screeds to ensure accurate rodding of plaster to true surfaces. Check the straightness in each corner and add grout to hold the external corner beads in correct and internal position to be fixed using corrosion resistant fasteners.

E. Before plastering starts, dampen, by spraying water concrete dash coat surfaces that are to receive plaster with clean water.

2. Application

A. All plaster shall be prepared in a mechanical mixer mix 1:5 (1 part cement and 5 part sand) using sufficient water to produce a workable consistency. Mix fiber 0.6 kg/m3 of the mortar or plaster by first mixing with some water (30%). After all the ingredients have been added including the remaining mixing water, the plaster should be mixed for a further few minutes until uniform fibre dispersion. Plaster not used within 1.5h from start of mixing shall be discarded.

B. The second coat shall be applied with sufficient material and pressure to ensure tight contact with dash coat.

C. The surface of the second coat shall be brought to a true, even plane with a rod or straightedge, filling surface defects in place with plaster.

D. Applied plaster shall be floated as smooth as possible and then steel-troweled. Steel troweling shall be delayed as long as possible and used only to eliminate the uneven points and to force aggregate particles into the plaster surface.

E. Each plaster coat shall be applied to an entire wall or ceiling panel without interruption to avoid cold joints and abrupt changes in the uniform appearance of succeeding coats. Wet plaster shall abut set plaster at naturally occurring interruptions in the plane of the plaster, such as corner angles, openings and control joints where this is possible.

F. Make internal angles and corners square.

G. Finished grooves shall be neat, of uniform width and depth, sharp straight edges and exact vertical and horizontal lines. Elevation grooves shall be cut before plaster sets by using molded guide or wooden strip and fixing it in temporary grout and screed. Regarding recessed, follow the procedures same as grooves.

H. Form cornices by plastering additional coats against pre-formed wood templates fixed onto plastered elevation. Make form wood templates to shapes, dimensions and projection indicated on drawings. Apply additional under coats in thickness not more that 10mm until obtaining required projection. Final finishes refer to item D.

I. Plaster should not deviate more than plus or minus 3mm in 3m from a true plane in finished plaster surfaces, as measured by a 3-m straight edge placed in any location on surface.

3. Curing

A. Provide sufficient moisture in the plaster by spraying water as frequently as required at least twice per day.

4. Cutting and Batching

A. Cut, patch, replace, repair and point up plaster as necessary to accommodate other work. Repair cracks and indented surfaces. Repair work to eliminate blisters, buckles, check cracking, and dry out as necessary to comply with visual effects.

B. To correct inaccuracies, dubbed out in thickness of not more than 10mm in same mix as base coat and total thickness of

dubbing must not exceed 25mm unless otherwise approved.

In areas where thickness is more than 20mm, apply dash

keying mix before adding new layer.

C. To correct inaccuracies in beam, column together with block work, chip carefully the concrete structures by using hammer and chisel to receive dash coat (follow the procedure in 1.C). For 25mm thick plaster repair apply it one time as per 2.B. For 45mm thick, apply 20mm first coat and apply keying mix before adding the new layer. Each layer must not exceed

10 mm, start again same as from 1C.

method of statement for marble stone

Summary: This method of statement for marble stone installation applies to the following;

1. Marble Stone Flooring

2. Marble Stair Treads and Risers

3. Marble Bases

4. Marble Threshold

• Materials for Application marble stone;

1. Marble Flooring, Locally Made

2. Marble Flooring Sylvia Light (

3. Marble Flooring Sylvia Medium Light

4. Marble Flooring Sylvia Medium

5. Stair marble Sylvia Light

6. Sand bed

7. Sand Cement Mortar Mix, 1:3-4 by volume

8. SBR

Preparation of marble stone:

1. Sand beds under floor tiles spread and compact it manually to obtain uniform depth and distribution. Remove stones and foreign materials. Lightly rinse with water.

2. Clean stone surfaces that have been become dirty or stained by removing soil, stains and foreign materials before setting. Clean stone thoroughly by scrubbing with fiber brushes and then drenching with clean water.

3. Examine concrete surfaces of stairs, flooring, base, and threshold for compliance with the requirements for installation tolerances and other conditions affecting performance of stone finish of stairs. Proceed to installation if satisfactory conditions have been achieved.

Tolerances of marble stone:

1. For position shown in plan for edges of steps, changes in color or

finish and continuous joint lines, not to exceed 3 mm in 2400 mm,

6 mm in 6 m or 10 mm maximum.

2. Do not exceed 3 mm in 3 m, 6 mm in 6 m or 10 mm maximum

From level or slope indicated for surface plane flooring.

3. Joint thickness shall not vary more than 1.5 mm or one fourth of

The nominal joint whichever is less.

4. Between planes and adjacent units it shall not exceed 0.8 mm.

marble stone installation:

1. General

a.) Execute flooring installation by skilled fixers and do necessary cutting at the site.

b.) Produce lines cut straight and true, with edges eased slightly to prevent stripping. Use power saws.

c.) Set stone to comply with drawings and shop drawings. Match for color and pattern by using units numbered in sequences as indicated.

d.) Produce lines cut straight and true, with edges eased slightly to joints.

e.) Produce lines cut straight and true, with edges eased slightly to standard specification referred for installation of stone paving and flooring.

f.) Locate and install expansion joints according to requirements of standard specification referred for installation of stone paving and flooring.

2. Flooring

a.) Marble flooring shall be set with thick wet mortar bedding on sand bedding with a thickness of 25-30 mm.

b.) Each stone shall be carefully set into a level and line required and shall Be beaten along full surface area to ensure firm setting and full contact between mortar and back surface of the stone.

c.) Tamp and beat stone with wooden block or rubber mallet to obtain full contact with the setting bed and bring finished surfaces within tolerances.

3. Treads

a.) Saturate with clean water several hours before placing setting bed.Remove surface water one hour before placing setting bed.

b.) Apply cement paste slush coat over surface of concrete about 15 minutes before setting placing setting bed. Limit area of slush coat

to avoid drying out before placing setting bed, the slush coat cement paste shall not exceed 1.5 mm.

c.) Apply mortar setting bed over cement-paste slush coat immediately after slush coat has been applied. Spread and screed setting bed to uniform thickness at sub grade elevations required for accurate setting of stone to finish grade as indicated.

d.) Place stone before initial set of cement occurs. Do not install one tread until riser of the preceding step has been set and mortar bedding suitable hardened.

e.) Tamp and beat stone with a wooden block or rubber mallet to obtain full contact with setting bed and to bring finished surfaces within

tolerances.

f.) Set each unit in a single operation before initial set of mortar, do not return to the areas already set and disturbed stone for purposes of realigning finished surfaces or adjusting joints. Finish stair tread perfectly plumbed as to lines indicated.

g.) Tool joints flat, uniform and smooth without visible voids.

4. Risers

a.) Set risers to line proceeding tread, provide top level edge and 25 mm clearance between back of riser and face of concrete step riser.

b.) Fix temporarily in place with gypsum dots and fill back clearance with cement and sand grout mixed with sufficient water to obtain pourable consistency. The ratio of cement to sand must be 400 kg of ordinary Portland cement to 1 m3 sand.

5. Bases

a.) Bed marble bases in thick mortar approximately 10 mm thick and install directly to masonry wall coated with plaster dash coat.

b.) Refer to the plans for the details on indicated drawings.

c.) The exterior and interior corners must be mitered at 45º.

d.) Grout joints, including joints with flooring with the same pointing mortar used in floors.

6. Threshold

a.) At locations adjacent to Jenna Marbles flooring, install stone threshold in same type of setting bed as abutting stone flooring.

b.) Set threshold in thin set, latex-Portland cement mortar at locations where mortar bed would otherwise be exposed above other adjacent flooring.

c.) At locations not adjacent to stone flooring, cut back and discard any setting bed material from the other finish side and leave mortar surface uniform with surface of threshold.

7. Adjusting, Cleaning and Protection

a.) Remove and replace marbles which are broken, damaged, stained, defective joints, stone paving and flooring not complying with other requirements indicated.

b.) Apply sealer to cleaned marble stone flooring according to sealer manufacturer’s written instruction.

c.) Prohibit traffic from the installed marble stone for at least 72 hours.

Method of statement for terrazzo tiles and skirting, Terrazzo Flooring

Summary: This terrazzo method statement includes the following;

• Ordinary Portland Cement

• Sand

• Materials for Application;

. Pre-cast Terrazzo

1. Terrazzo Stone Preparation

Method of statement for terrazzo tiles and skirting

A. Examine areas to be installed with terrazzo tiles for compliance and tolerances affecting its installation.

B. Control dust to prevent air pollution and protect other work from dust generated by grinding operations.

2. Application of Terrazzo Marble

A. Set lay-out for terrazzo tiles referred from the building geometry.

B. Arrange terrazzo tiles continuously beginning from the center line so that symmetry will be achieved. See to it that 100% of the face underneath the tiles is covered with mortar so that there will be no lack of bond with substrate and it will not emit a hallow sound when tapped.

C. Cut tiles using electric saw to exact dimension and fill between joints a specified sealer.

D. During installation, clean promptly the surface of the tiles from mortar or grout splashes to maintain a neat condition.

E. Limit surface variations from level indicated in the drawing to 3 mm maximum.

3. Project Method of statement for Cleaning and protection

A. Wash surfaces with cleaner to remove splashes of mortar and sealer.

B. Rinse with water and allow to dry thoroughly.

C. Make sure that the area with terrazzo tiles will be free from damag specially exposed corners.