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    Whats the name of the cement that dries underwater?

    Try 'Extra Rapid' from Lafarge
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    Last years cement - any good?

    It will still work if it hasnt got lumps in it, but be aware that after the use by date (on the bag), it may have raised levels of chromium six, which can increase risk of dermatitis Just wear gloves and wash off any spills on the skin and change out of your jeans if they get impregnated with...
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    concrete path

    Dont use it if there is any plaster in it and only use it as a small proprtion of the ballast. It tends to suck up water and make a weak concrete if you use too much of it
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    Fixing pavers to concrete step

    If the slabs are very dry, dampen the underside before laying - it improves the bond
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    How do you get rid of builders dust?

    Henry is definitely the answer, almost indestructable. Previous tips about removing stiff from rooms and sealing rooms also good for next time
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    crack in mortar joint

    I wouldn't do anything at this stage, just a small crack But I would check it out every few months. If the cracking spreads to a bigger area then its time to think about what migtht be causing the problem and then fixing it
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    Fibolite blocks-any issues?

    Hi Hi suction blocks can easily be rendered if you control the suction Damping down the blocks as you suggested is a good start and the use on an SBR bonding agent also helps
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    Postcrete - Ok outside?

    Correct, the shelf life is to do with minimising the risk of chromate dermatitis (only a few% of people are actually susceptible). If you use out of date materials take precautions to keep it off your skin. Otherwise the plastic packing is usually OK for months outside. If the bag still feels...
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    Why Should Paving Slabs Be Laid On A Wet Mix?

    If you lay the slabs on a semi dry mix such as Slablayer, its a good idea to dampen the underside of the slabs just before you lay them. It stops them sucking moisture out of the bedding and improves the bond
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    Must I use Block Paving Sand or Can I use Other?

    Agree with r896neo Kiln dried paving sand is whats needed for a good durable job
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    Fireplace Project

    Hi If you have to repoint any existing brickwork, make sure you use a mortar containing sulfate-resisting cement.Often the bricks have abosorbed loads of sulfate salts when the chimney was in use
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