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  1. #1

    Hardiflex or gypsum board for the ceiling?

    am building my own house.. ano mas maganda sa ceiling, hardiflex or gypsum.. kadalasan ng kakilala ko naka gypsum kasi malamig sya sa house pero parang gusto ko hardiflex dahil mas matibay to... what do you think?? and pareho lang ba prices nito?? thanks!

  2. #2
    I'd be wary of using Hardiflex: the California authorities have found it to have possibly carcinogenic elements (particularly dust when it is being sawn). This might be more dangerous to workers who saw the Hardiflex during construction, than to homowners who live in the house after the Hardiflex has been finished and painted, but I still wouldn't trust its integrity over the years. Reminds me too much of asbestos.

    I don't know about gypsum board, but it also seems like a "dusty" material like the above.

    I'm building a house myself and decided to go for marine plywood, however old-tech it is. I just feel safer with it.

    Your call, though.

  3. #3
    If youre bogged down with budget constraints gypsum board fits you but our weather isnt gypsum board friendly... This board sucks in moisture and if you develop a leak from the roof the board will crumble... Ive seen this in the Paranaque City Hall before, they used gypsum board...

    For my house, I used hardiflex and marine plywood... We finished building it last year and still looks good

  4. #4
    hardiflex does the job fine. it's better than using plywood dahil it's somehwat water proof na. and it's easier to paint. and the best part is, laging makinis ang harap. so madali lang pinturahan for the painter.

    "FlexBoard" is a good cheaper alternative hardiflex.

  5. #5
    Ano yung flexboard at saan nabibili? Interested ako eh.

  6. #6
    usually, mga wholesalers ng plywood ang meron nito.

  7. #7
    Quote Originally Posted by cutiecle View Post
    am building my own house.. ano mas maganda sa ceiling, hardiflex or gypsum.. kadalasan ng kakilala ko naka gypsum kasi malamig sya sa house pero parang gusto ko hardiflex dahil mas matibay to... what do you think?? and pareho lang ba prices nito?? thanks!
    usually gypsum board is used in offices to keep the noice down.. good sound absorption.. its pricey compared to hardiflex.. i'd reccommend hardiflex since it is sturdy anyways and its better to use at home=)

  8. #8
    1. gypsum board is an acoustical materials. use for ceiling & walling.
    You need a metal furring & screw. Mas easy rin to make a hole for
    lightings fixture & utility box. Mas ok n mag connect ang gypsum board di kc halata ang ang dugtungan if malagyan ng putty & paint
    unlike s marine plywood sometimes halata ang lines.
    the disadvantage is parang nadudurog pag nag lalagay ng hole, expensive rin. S mga mall yan ang ginagamit & sa mga manssion house. kung may budget ka gypsum board n lang.

    for office - accoustical board din ang ginagamit then may T-runner.

    2. hardiflex- mas ok sya for fire protection.

    3. marine plywood - Maganda rin gamitin kapalan n lang ang putty para di masyadong halata ang dugtungan.

  9. #9
    marine is best. kaso marine is expensive eh. the fact that you need to masilya the whole thing para kuminis before you can paint on it just compounds to the cost even more. Labor pa.

    keep in mind that the cost of the plywood doesnt end with the purchase of the piece of plywood. may kasama pang masilya and time and labor yan pag pipinturahan na.

    kaya overall, hardiflex gives you the best value for your money in the long run. di pa sya aanayin.

  10. #10

    How about this one?

    http://www.omniboard.net/index.html


    Fibre cement board. Check the website.

    OMNIBOARD is made to withstand harsh environmental and tropical conditions. This product is made from Gemelina woodwool fibers, reinforced with bamboo or rattan strips and bonded with Portland cement.

    OMNIBOARD is resistant to water, fire, termites, and fungi. It possesses both acoustical and thermal insulation values.

    OMNIBOARD is highly workable with common tools. It can be sawn best with circular saw. It can be sanded, nailed, screwed, routered, riveted, plastered or topped with concrete and painted with water-based paints

  11. #11
    i really recommend marine plywood maybbe a little bit expensive but in the long run its much much better than gypsum & hardi flex

    gypsum & hardiflex are too brittle when it will absorb water vapor & heat ..just be sure to treat your marine plywood w/ anti termite or better the wood frame where it will be attach

  12. #12

    Don't use Gypsum

    I wouldn't recommend gypsum. ginamit ito sa construction ng office ng fiancee ko and they encountered lots of problem with it. once you've also tried to attach some fixtures, di siya magiging steady since yung spot na ginamitan mo ng nails/screw/or anything pointed, nagiging powder and babagsak lang ang fixtures.

  13. #13
    sir beerhandbop bakit po mas maganda ang hardiflex? sa kabilang topic po kasi ang sbi mas okay ang gypsum board?

  14. #14
    # Gypsum board must not be used in areas that are continuously or repeated exposed to excessive moisture or steam such as saunas, gang shower rooms or swimming pool enclosures.
    # Gypsum board should not be exposed to sustained temperatures exceeding 125F.

    for the cemen board please click the link...

    http://en.wikipedia.org/wiki/Cement_board

  15. #15

    Cement Board Installation

    Framing

    Hardiflex boards can be installed over wood or steel framing. All construction shall comply with local building codes, including the use of vapor barriers where required. Unheated spaces above ceilings should be properly ventilated.

    Framing members and other surfaces must be straight, true, of uniform dimensions and properly aligned.

    Attachment

    1. Hardiflex boards should be installed on the ceilings first. Application at right angles to the framing is preferable.
    2. Unless specified on fire or sound rated assemblies, horizontal wall application is recommended to give added strength and reduce the number of joints.
    3. Starting in the upper corner of the wall, work across and down. Ends and edges of sheets should be touching but not forced tightly together.
    4. Holding Hardiflex board firmly against the framing, begin fastening in the center of the sheet and moved outward toward ends and edges.
    5. Set fasteners heads slightly indented from the surface without breaking the face paper or damaging the gypsum core.
    6. Installed sheet in a brick pattern with the ends staggered and supported by framing members. Joints shall not fall on the same studs as those directly on the opposite side of the wall.
    7. Cut openings out of full sheets or lay out joints to fall on the studs nearest the center of the doors and windows. Where possible, position full sheets to extend completely above and below openings and avoid piecing.

    Control Joints

    Control joints, as specified and detailed by the architect, shall be installed in the following situations:

    * In ceilings exceeding 2500 sq. ft. in area and where the framing or furring changes direction. The distance between control joints shall not be greater than 50 ft. in either direction.
    * In partition, wall and wall furring runs exceeding 30 ft. in length. Distances between control joints should not be greater than 30 ft.. Wall or partition height door frames may be utilized as control joints.
    * Opposite of where a control joint occurs in the exterior base wall construction.
    * To coincide whenever possible with construction joints of the building.

    When partitions are erected to span the full height of the slabs between floors as required for fire or STC rated assemblies, a perimeter relief joint shall be used at the top to accommodate normal structural slab or beam movement without loading partition.

    Joint, Corner and Surface Preparation

    These areas should be finished in accordance with ASTM S 840, the GA - 216 and the joint compound manufacturer's instructions.

    1. No treatment of joints shall be done until the interior temperature has been maintained at a minimum of 50F for at least 48 hours prior to application of compounds and until all materials have completely dried. Adequate continuous ventilation must also be provided.
    2. Fill and level joints with joint compound.
    3. Embed tape into the wet compound and allow to dry. For inside corners, crease the tape and work it into joint.
    4. Apply a second coat of compound across the joint, feather to approximately 4 inches on each side.
    5. Apply a third coat of compound and feather to approximately 6 inches.
    6. Allow each coat of compound to dry before proceeding.
    7. Attach corner bead to outside corners and apply three coats of compound. Feather out each coat as described in steps 4 - 6.
    8. Spot cover all fastener heads with three coats of joint compound applied in different directions.
    9. Lightly sand the last coat of all treated areas, taking care no to rough the surrounding gypsum board paper. Smoothing can also be accomplished with a damp sponge.

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  17. #16
    In South Luzon Area particularly in Cavite..

    KELLY HARDWARE in Bacoor, Cavite is the number dealer of Hardiflex cement board, may branch din sila in PalaPala, Dasmarinas City - EVY Hardware.

  18. #17
    Looks like big difference in price between Hardiflex and Flexboard. Hardiflex is about P600 or so (6 mm) while Flexboard is about P300 or so.

    Besides price and brand, is there any difference between them, e.g., quality? properties? lifetime?

    Is Flexboard locally manufactured? Imported? From China?

  19. #18
    dami nako nakita nabagsakan ng hardiflex hehehe... mabigat kasi at madali mabasag. kung may gagawin ka sa kisame di pa pwede tuntungan mas ok parin ang 2x2 na kahoy at 1/2" na kapal ng flywood
    dun gawa kisame namin. regular na apply lang solignum ok na di na aanayin

  20. #19
    Yes, fiber cement is very heavy. Density comparison, lowest to highest:

    Omniboard (woodwool cement bonded board)
    - Low density 300-350 kg/cu.m
    - Medium density 550-600 kg/cu.m
    - High density 850-910 kg/cu.m
    Marine plywood (best locally available) ~480 kg/cu.m
    Magnesium oxide 700-800 kg/cu.m
    Fiber cement
    - Hardiflex 1,298 kg/cu.m
    - Flexboard 1,340 kg/cu.m

    So, weight of 4 x 8 ft:
    MgO 6 mm - 12-14 kg
    Omniboard, med. 10 mm - 16 kg
    Marine ply 1/2" - 17 kg
    Hardiflex 6 mm - 23-25 kg
    Last edited by agave; Feb 19, 2011 at 01:18 PM.

  21. #20
    Gypsum board. Yung may 1hr fire-rating.

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