Frequently asked questions about the Building knives category
Building knives — what are they and what are they used for?
Building knives are hand tools with replaceable or snap-off blades for cutting plasterboard, mineral wool, linoleum, cardboard and packaging; common blade widths are 9–25 mm and handles are metal or plastic to allow quick blade changes and precise cuts.
What types of building knives are there and how do they differ?
Types include fixed-blade knives, snap-off blade knives (9–25 mm), folding pocket knives and professional quick-change models; they differ by blade width, handle material (metal/plastic) and locking mechanism (automatic, slider or screw).
Which replacement blades fit Olfa and Novipro building knives?
Olfa knives typically take 18–25 mm blades (models BN-AL, EXL, XH-1 etc.); Novipro uses standard 9–25 mm snap-off or straight blades compatible with PUSSNUGA and TASKUNUGA models. Always check blade width and mount type for your specific model.
How do DeWalt and Milwaukee knives differ from Olfa and Hultafors?
DeWalt and Milwaukee focus on durable bodies and quick-lock mechanisms, often with metal rails; Olfa and Hultafors are known for blade quality and ergonomic design for precision cutting. Choose based on usage frequency and preferred locking type.
Which knives are best for cutting plasterboard and mineral wool?
For plasterboard use sharp narrow blades (18–25 mm) and a comfortable handle for straight cuts; for mineral wool prefer longer blades and models with fibre-resistance or protective designs—professional Hultafors or OLFA knives are suitable.
How to choose between 9 mm and 18 mm replaceable blades?
9 mm is good for fine, detailed work and portability; 18–25 mm offers strength for plasterboard and packaging. Choose wider blades for dense materials and narrower for precision tasks.
Snap-off blade knives: how to correctly remove segments?
Hold the handle firmly, extend the blade to the required segment and carefully snap it off along the guide, using pliers for safety if needed. Always use the protective cap and replace the blade when worn.
What accessories and spare blades should I buy for a building knife?
Buy spare blade packs (5–20 pcs) in the correct width, magnetic blade holders, protective caps and specialty blade sets (hooked or straight). These keep work continuous and reduce downtime.
What are the advantages of Japanese building knives?
Japanese knives often feature highly hardened blades and a fine cutting geometry for precise work; they are durable, very sharp and available in folding or snap-off variants.
Which knives from the range are suitable for professional site use?
For professionals choose metal-bodied knives with quick-locking mechanisms — Hultafors, OLFA (EXL, BN-AL series) and professional Novipro models with spare blade kits and reinforced handles.
How to care for a building knife so the blade lasts longer?
Keep the knife free of resin and fibres, regularly change segments or blades, use a protective sheath and avoid cutting metal; lubricate metal rails on slider knives for smooth operation.