TLDR: Sim, mesmo que seja um material raro e caro

Resposta longa:

Weirwood é dito ser uma madeira de boa qualidade, que nem apodrece:

It was a weirwood ancient and colossal, ten times the size of the one in the Stone Garden at Casterly Rock. This tree was bare and dead, though. "The Brackens poisoned it," said his host. "For a thousand years it has not shown a leaf. In another thousand it will have turned to stone, the maesters say. Weirwoods never rot."

_{A Dance with Dragons - Jaime I}

Existem vários usos da árvore de represa:

Como material para armas:

• Arco de Brynden Rivers:

  Brynden Rivers, A.K.A. Bloodraven usou um arco longo de madeira, junto com seus guardas particulares, The Raven's Teeth.

  From Maidenpool had come Lord Mooton, from Raventree Lord Blackwood, from Duskendale Lord Darklyn. The royal demenses about King's Landing sent forth Hayfords, Rosbys, Stokeworths, Masseys, and the king's own sworn swords, led by three knights of the Kingsguard and stiffened by three hundred Raven's Teeth with tall white weirwood bows. Mad Danelle Lothston herself rode forth in strength from her haunted towers at Harrenhal, clad in black armor that fit her like an iron glove, her long red hair streaming. The light of the rising sun glittered off the points of five hundred lances and ten times as many spears. The night's grey banners were reborn in half a hundred gaudy colors. And above them all flew two regal dragons on night-black fields: the great three-headed beast of King Aerys I Targaryen, red as fire, and a white winged fury breathing scarlet flame. Not Maekar after all, Dunk knew, when he saw those banners. The banners of the Prince of Summerhall showed four three-headed dragons, two and two, the arms of the fourth-born son of the late King Daeron II Targaryen. A single white dragon announced the presence of the King's Hand, Lord Brynden Rivers. Bloodraven himself had come to Whitewalls.

  _{The Mystery Knight}

  

• Arcos dos Filhos da Floresta:

  "They were a people dark and beautiful, small of stature, no taller than children even when grown to manhood. They lived in the depths of the wood, in caves and crannogs and secret tree towns. Slight as they were, the children were quick and graceful. Male and female hunted together, with weirwood bows and flying snares. Their gods were the gods of the forest, stream, and stone, the old gods whose names are secret. Their wise men were called greenseers, and carved strange faces in the weirwoods to keep watch on the woods. How long the children reigned here or where they came from, no man can know.

  _{A Game of Thrones - Bran VII}

• Arco de Ygritte:

  ao contrário do programa de TV, nos livros, Ygritte tem um arco feito de chifre e madeira escura

  Ygritte trotted beside Jon as he slowed his garron to a walk. She claimed to be three years older than him, though she stood half a foot shorter; however old she might be, the girl was a tough little thing. Stonesnake had called her a "spearwife" when they'd captured her in the Skirling Pass. She wasn't wed and her weapon of choice was a short curved bow of horn and weirwood, but "spearwife" fit her all the same. She reminded him a little of his sister Arya, though Arya was younger and probably skinnier. It was hard to tell how plump or thin Ygritte might be, with all the furs and skins she wore.

  _{A Storm of Swords - Jon II}

• Lança de Styr:

  ao contrário do programa de TV, nos livros, Styr tem uma lança feita de bronze e madeira de guincho

  It was then that he saw Styr. The Magnar was climbing up the barricade, over the gutted corn sacks and smashed barrels and the bodies of friends and foe alike. His bronze scale armor gleamed darkly in the firelight. Styr had taken off his helm to survey the scene of his triumph, and the bald earless whoreson was smiling. In his hand was a long weirwood spear with an ornate bronze head.

  _{A Storm of Swords - Jon VII}

Como material para edifícios:

• A mesa de reunião da Guarda Real

  The table itself was old weirwood, pale as bone, carved in the shape of a huge shield supported by three white stallions.

  _{A Storm of Swords, Jaime VIII}

  

• O trono do Eyrie

  The wretched boy had started it, looking down on him from a throne of carved weirwood beneath the moon-and-falcon banners of House Arryn. [...] Lady Lysa rose from her weirwood throne.

  _{A Game of Thrones - Tyrion V}

  

• Porta da Lua do Eyrie

  Her small mouth twitched in a petulant smile. "If you are tried and found to be guilty of the crimes for which you stand accused, then by the king's own laws, you must pay with your life's blood. We keep no headsman in the Eyrie, my lord of Lannister. Open the Moon Door." The press of spectators parted. A narrow weirwood door stood between two slender marble pillars, a crescent moon carved in the white wood.

  _{A Game of Thrones - Tyrion V}

  

• Portão preto de Nightfort

  A turn or two later Sam stopped suddenly. He was a quarter of the way around the well from Bran and Hodor and six feet farther down, yet Bran could barely see him. He could see the door, though. The Black Gate, Sam had called it, but it wasn't black at all. It was white weirwood, and there was a face on it. A glow came from the wood, like milk and moonlight, so faint it scarcely seemed to touch anything beyond the door itself, not even Sam standing right before it. The face was old and pale, wrinkled and shrunken. It looks dead. Its mouth was closed, and its eyes; its cheeks were sunken, its brow withered, its chin sagging. If a man could live for a thousand years and never die but just grow older, his face might come to look like that.

  _{A Storm of Swords - Bran IV}

  

• A Casa do Preto e Branco: Um portão da Casa de Preto e Branco é feito de madeira de esquife, o outro sendo feito de ébano. as cadeiras também são feitas de weirwood

Sim

Dunk se depara com um prédio onde as vigas são feitas de árvores de represa.

They seated the hedge knights well below the salt, closer to the doors than to the dais. Whitewalls was almost new as castles went, having been raised a mere forty years ago by the grandsire of its present lord. The smallfolk hereabouts called it the Milk house, for its walls and keeps and towers were made of finely dressed white stone, quarried in the Vale and brought over the mountains at great expense. Inside were floors and pillars of milky white marble veined with gold; the rafters overhead were carved from the bone-pale trunks of weirwoods. Dunk could not begin to imagine what all of that had cost.
_{The Mystery Knight}

Também é mencionado que o weirwood pode ser usado como material para arcos.

From Maidenpool had come Lord Mooton, from Raventree Lord Blackwood, from Duskendale Lord Darklyn. The royal demenses about King's Landing sent forth Hayfords, Rosbys, Stokeworths, Masseys, and the king's own sworn swords, led by three knights of the Kingsguard and stiffened by three hundred Raven's Teeth with tall white weirwood bows.
_{The Mystery Knight}

Também vemos lanças de weirwood, Styr tem uma em um encontro com Jon.

It was then that he saw Styr. The Magnar was climbing up the barricade, over the gutted corn sacks and smashed barrels and the bodies of friends and foe alike. His bronze scale armor gleamed darkly in the firelight. Styr had taken off his helm to survey the scene of his triumph, and the bald earless whoreson was smiling. In his hand was a long weirwood spear with an ornate bronze head.
_{A Storm of Swords, Jon VII}

A mesa de reunião da Guarda Real é feita de madeira de curral.

The table itself was old weirwood, pale as bone, carved in the shape of a huge shield supported by three white stallions.
_{A Storm of Swords, Jaime VIII}

A Porta da Lua e o trono no Ninho de Águia são feitos de madeira de vime.

The press of spectators parted. A narrow weirwood door stood between two slender marble pillars, a crescent moon carved in the white wood.
_{A Game of Thrones, Tyrion V}

The wretched boy had started it, looking down on him from a throne of carved weirwood beneath the moon-and-falcon banners of House Arryn.
_ibid

Existem outros exemplos também; veja a página Wiki do Gelo e do Fogo para uma análise mais completa.

Harrenhal. Em Clash of Kings, o tio de Catelyn diz a ela que o Rei Harren, o Negro, queria o Castelo mais alto e passou 40 anos construindo Harrenhal. Weirwoods foram cortados para vigas e vigas.