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Pebble dash mixture

  • 23-02-2021 11:18pm
    #1
    budhabob
    Registered Users, Registered Users 2 Posts: 4,871 ✭✭✭


    Hi folks,

    I want to patch a driveway pillar that has pebble dash on it. We removed a section of adjoining wall so there is a section of damaged pebble dash. The plan is to paint the pillars in any case as it would brighten the driveway so the quality of my finish isn't the end of the world.

    Just wondering does anyone have any experience on the mix ratios I should use?

    Thanks in advance


Comments

  • #2
    Donalde
    Registered Users, Registered Users 2 Posts: 56 ✭✭Donalde


    The mix recommended by Irish Cement, in an old brochure titled 'Cement on the Farm' is as follows:
    Rough Cast:
    1part cement; 1.5 parts lime; 2 parts sand; 5 or 6 parts pebble.
    I would think the lime is important for adhesion and cannot be replaced by plastisizer.

    For the record the other mixes in the brochure are:
    Scud:
    1 part cement; 2 or 2.5 parts sand.

    Undercoat and Finish - External use:
    1 part cement; .5 part lime; 4 or 4.5 parts sand.
    or 1 part cement ; 4 parts sand +plasticizer.

    Undercoat and finish - Internal use:
    1 part cement; 3 parts sand

    Mortar mix:
    1 part cement; 1 part lime; 6 parts sand.
    or
    1 part cement; 5 or 6 parts sand; + plasticizer.

    I have used cement waterproofing additive in roughcast instead of lime with satisfactory results.


  • #3
    budhabob
    Registered Users, Registered Users 2 Posts: 4,871 ✭✭✭budhabob


    Donalde wrote: »
    The mix recommended by Irish Cement, in an old brochure titled 'Cement on the Farm' is as follows:
    Rough Cast:
    1part cement; 1.5 parts lime; 2 parts sand; 5 or 6 parts pebble.
    I would think the lime is important for adhesion and cannot be replaced by plastisizer.

    For the record the other mixes in the brochure are:
    Scud:
    1 part cement; 2 or 2.5 parts sand.

    Undercoat and Finish - External use:
    1 part cement; .5 part lime; 4 or 4.5 parts sand.
    or 1 part cement ; 4 parts sand +plasticizer.

    Undercoat and finish - Internal use:
    1 part cement; 3 parts sand

    Mortar mix:
    1 part cement; 1 part lime; 6 parts sand.
    or
    1 part cement; 5 or 6 parts sand; + plasticizer.

    I have used cement waterproofing additive in roughcast instead of lime with satisfactory results.

    Thank you, that's brilliant


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