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Dr. Nihad Almughany

University of PalestineFaculty of Applied Engineering and Urban Planning

Dept. of Architecture2nd Semester 2010 -2011

Building Construction II (EAAS 3202 )

Lecture 6

PLASTERING WORKS

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Review of Last Lecture– Types of Glass and application– Glazing:– Factors taken in consideration in glazing:

• Tolerance• Glass edges• Rebate

– Glazing methods:• Glazing without beads• Bead Glazing• Gasket Glazing• Patent Glazing

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Plastering Works

– Preparatory works before plastering:• Electric, mechanical and communication

networks

• Plumbing networks

• Windows and doors frames (for some types only)

• Sills

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Plastering Works – Advantages of Plastering:

• Intermediate internal surface for final finishing• Provide an external surface and appearance• Prevent damp• Internal partition • False ceilings

(Therefore, plaster should be able to adhere on the surface and stand whether changes)

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Internal Plastering– Materials of Internal plastering: Cement: Portland normal cement االسمنت

العادي البورتالندي– Lime المطفأ الجير– Water الشوائب الخاليمن الماء– Metal lath: المعدني الشبك

• Strip mesh• Corner mesh• Corner bead• Plaster stop bead• Metal lath sheets

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Internal Plastering– Layers of Normal (cement) plastering:

• Scratch coat:( المسمار ( الطرطشة طبقة– Cement (1) - sand or trabya (2)

• Brown coat: ( الخشنة ( البطانة طبقة– Cement (1) - Lime (.5) - sand or trabya (4) - Water

• Finish coat:– Cement (1) - Lime (1) - sand or trabya (4) - Water

المعلقة ( – لألسقف المعدني الشبك على القصارة مالحظةفقط والظهارة البطانة طبقتي من تتكون القواطع أو

ملدنة بمواد ويستبدل جير بدون ولكن

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External Plastering– Layers of Normal (cement) plastering:

• Scratch coat:( المسمار ( الطرطشة طبقة– Cement (1) - sand or trabya (2)

• Brown coat 1st layer: األولى البطانة طبقة( الباطون(

– Cement (1) - sand or trabya (1) – Poly bond (glue) – Water

• Brown coat 2nd layer: الثانية البطانة طبقة– Cement (1) - lime (.25) - sand or trabya (3) – Water

• Finish coat:– Cement (1) - Lime (.5) - sand or trabya (4) - Water

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External Plastering– External Plastering – Stucco : بالشبريز القصارة

• Scratch coat:( المسمار ( الطرطشة طبقة– Cement (1) - sand or trabya (2)

• Brown coat 1st layer: ( الباطون ( األولى البطانة طبقة

– Cement (1) - sand or trabya (1) – Poly bond (glue) – Water

• Brown coat 2nd layer: (roughخشنة ) البطانة طبقة الثانية

– Cement (1) - lime (.25) - sand or trabya (3) – Water

• Stucco coat: الشبريز طبقة– Cement (white) (1) - Quartz (3) – Water - color

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Implementation of Plastering Works– Rules of plastering implementation:

• 1- Cleaning the surface• 2- Remove reliefs and fill holes (in layers not exceeding

15 mm)• 3- Spray water• 4- Fix metal laths• 5- Scratch coat – after 24 hours spray water for one day

and leave it to dry• 6- To achieve a level surface apply leveling elements at

the level of brown coat(( والودعات البقجللمواد: مكلفة أنها والودعات البقج عيوب من مالحظة

السببوألن لهذا غزة في تستخدم ال وللوقتووالعمال ومستو منتظم البناء في المستخدم البلوك

ومدربين مهرة

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Implementation of Plastering Works

– Rules of plastering implementation (con.):• 7- Applying brown coat and leave it for 24 hours , scratch it and spray

water for one day.• 2- Apply final coat and smooth the surface , leave it for 24 hours and spray

water for 2 days.

Notes: - It brown coat more than15 mm apply it on layers and if more than 30 mm add a galvanized metal lath.- Use mortar in one hour only.- Do not reuse falling mortar unless the surface is clean and in a period of less than half an hour.- In construction joints of plaster stop plastering in a horizontal and vertical straight lines and with rough inclined edges – and when continue, clean, rough, spray water and add (roba) to the joints.

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Special kinds of Plaster

– Granulate: الجرانوليت • A special layer of plaster composed of aggregates, cement, sand and glue

applied on surfaces after basic layers.• It has many advantages and could have many shapes by using aluminum

for forming the shapes.

– Marmarina:( ) السمسمية المرمرينا• A decorative final layer applied of typical plastering

layers and has many advantages in water proofing and decoration.

• Composed of ground marble, acrylic materials, glue and other additions.

• Surfaces should be painted with Pendrol before applying Marmarina.

• Apply the whole surface continuously without making joints.

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Special kinds of Plaster

– Lime Plastering: الجير قصارة

• A plaster used in internal surfaces

• Same layers of internal plaster except final coat

• Final coat is composed of: Lime, cement and fine sand

• Gives more leveled surface

• Have some advantages and disadvantages

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Defects in Plasteringقبول عند وفحصها الواجبمراعاتها االمور

: القصارة استالم التموج–التطبيل–التشققات:–

ودقيقة • سطحيةغائرة•

اللون – اختالفالصدأ – بقعوالحواف – والزوايا األسطح استواء عدم

العيوب: – تلك من تناقشاسبابكل مالحظةعالجها ووسائل فحصها وطرق

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Quantity Surveying of plaster

: القصارة في الكيل طرق

وتحسب • المربع بالمتر القصارة تكالفي وخاصة الطولي بالمتر والحواف الزوايا

البلدي الكيلالبلدي • الكيلالهندسي • الكيل